BB Conversion issues and Offset mounts

[fstrthnu]

I dropped a 454 in my 69 nova this weekend and found that I needed the offset trans mount. I wanted to scour some of our local junk yards before I buy online. What types and year of cars did these offset trans mounts come on. this is for the 400 trans.

[Paul Wright]

An offset trans mount? I think you are mistaken.

[69NovaSS]

I believe since the BB frame mounts offsets the motor towards the passenger side of the car that the BB tranny mount is also offset towards the passenger side of the car so that the motor and tranny are installed straight in the car and not at an angle.....now you can get the correct aftermarket th400 tranny crossmember which is offset towards the passenger side of the car OR you can just elongate the holes in your current tranny crossmember so that the mount itself can be offset towards the passenger side....I'm pretty sure that this info is correct:)

[fstrthnu]

That is what I was wondering is the nova or camaro the only cars that have the bb crossmember or is there other cars that have the same one. Also the pass side frame mount looked higher than the driverside. This was a 350 car and i pulled 350 out of the car but it was not original motor though. Was the sb mounts offset like the bb mounts? Thanks for the replies

[69NovaSS]

That is what I was wondering is the nova or camaro the only cars that have the bb crossmember or is there other cars that have the same one. Also the pass side frame mount looked higher than the driverside. This was a 350 car and i pulled 350 out of the car but it was not original motor though. Was the sb mounts offset like the bb mounts? Thanks for the replies

I dont think so...I will run out an measure my frame mounts I believe the factory SB mounts were the same on both the pass and drivers side...the BB frame mounts offset the motor towards the passenger side to gain clearance at the power brake booster with the valve cover....

[69NovaSS]

the frame mounts on my SB car are within a 1/16" of being the same height so I would suspect the SB cars were not offset

[fstrthnu]

great, back to jacking this thing up again. thanks for the help.

[69NovaSS]

Glad to have been of help:)

[Paul Wright]

I believe since the BB frame mounts offsets the motor towards the passenger side of the car that the BB tranny mount is also offset towards the passenger side of the car so that the motor and tranny are installed straight in the car and not at an angle.....now you can get the correct aftermarket th400 tranny crossmember which is offset towards the passenger side of the car OR you can just elongate the holes in your current tranny crossmember so that the mount itself can be offset towards the passenger side....I'm pretty sure that this info is correct:)

I believe you are mistaken as well. Some BB frame mounts are taller on one side for clearance, but they aren't "offset". Offsetting the engine and transmission would cause a misalignment of the driveshaft. GM used the same centerlines and rear face of block dimensions to allow easy interchanges. There is no "big block" crossmember. The TH400 crossmember fits both SB and big blocks and is not offset.

[69NovaSS]

I believe you are mistaken as well. Some BB frame mounts are taller on one side for clearance, but they aren't "offset". Offsetting the engine and transmission would cause a misalignment of the driveshaft. GM used the same centerlines and rear face of block dimensions to allow easy interchanges. There is no "big block" crossmember. The TH400 crossmember fits both SB and big blocks and is not offset.

I wouldn't be too sure about that....cause just about every thread on this site that has ever disscussed this topic has largely said that the BB is placed closer to the passenger side of the car then the drivers side of the car...It has also been said that the transmission is also offset towards that side of the car too.....Look at the attached pic below. Its from the current J&W Nova Cat. The rear tranny mount pad is clearly offset (IE its not in the middle of the crossmember). And even your pic (though its a little small) does indeed show the mount pad as being offset or my ruler is lying to me...

[fstrthnu]

It looks offset to me! I do a lot of research on the web for projects I work on but I do not post a lot. Sorry if I used the wrong wording or lingo just trying to get some facts. Hey Paul got a extra one of those laying around? Thanks guys

[69NovaSS]

Besides....logically speaking if the mounting surface for the frame mount was perfectly level then ya adding a taller frame mount to one side or the other would just raise that side of the motor BUT since the mounting surface for the frame mount is on an angle it will not only move the motor slightly higher but it will also move the motor slightly sideways too....it has too...

You will notice on the attachment below that the mount hole on the tall frame mount not only moves upward but it also moves sideways when you compare it to the mount on the short frame mount...thus moving the motor slightly upwards AND slightly towards the opposite side of the car too........so the motor would indeed be offset if the other motor mount was one that was shorter then the tall one....and we both know that the BB cars used a tall and short frame mount not two tall ones or two short ones...but one of each...so the motor must be offset

[Real McCoy]

On the rearends I checked while building the 12 bolt for my car they had the pinion offset 1 inch toward the passenger side. I was told when I asked about that it was that way because the motors and trans were offset to the passenger side. So that would support the offset and driveshaft alighnment issues. I built mine with the pinion offset 1 inch and it seems centered in the driveshaft tunnel as well.

[Paul Wright]

I wouldn't be too sure about that....cause just about every thread on this site that has ever disscussed this topic has largely said that the BB is placed closer to the passenger side of the car then the drivers side of the car...It has also been said that the transmission is also offset towards that side of the car too.....Look at the attached pic below. Its from the current J&W Nova Cat. The rear tranny mount pad is clearly offset (IE its not in the middle of the crossmember). And even your pic (though its a little small) does indeed show the mount pad as being offset or my ruler is lying to me...


Well, I put a piece of paper on the screen and marked the centerline and the outer bolt holes. then I shifted it to the other side and it's the same. I think this picture is an optical illusion because the bends aren't even.
The Classic Industries web site said the G7364 cross member I showed as fitting both big and small block TH400 applications. One part number can't be welded offset for big blocks and not offset for small blocks.

However, I didn't want to respond until I did some more research.

Here's what I found in an old (June '91) Super Chevy article "Swap Shop" by Wayne Scaraba.
The basic crossmembers are broken down into three groups-the hydramatic 400 (PN3912573),the TH350,PG, 3 & 4 speed (PN3899006) and the big block (PN3912570). What makes the fat block cross members different? In general, the Rat motored examples featured sturdier construction (along with a varied lower lower bolt access shape) and that's it.
In a pinch, a small block crossmember will easily work-just be sure to use the right crossmember for the appropriate transmission.

While it's possible that aftermarket crossmembers may be welded offset, I don't recall the original crossmembers being that way. That would cause problems with driveshaft misalignment for Big blocks which are the most powerful and least forgiving of misalignment.
Rear axles do have an "offset" but it's because the pinion is offset to the ring gear making the housing not symetrical.

I may have to order an OEM crossmember (3912570) from GM to find out for myself if it has a unique "big block" offset.

If I am wrong (and that also means Super Chevy is too) I will admit it.

Here's the three basic frame mounts for 1st gen Camaro (F body) and 3rd Gen Nova (X body)
Close scrutiny shows the difference and why. The big block engine is dimensionally different than the small block. It's longer and wider. Both the small block and the big block are installed with the rear face of block in the same plane to allow the transmission to be in the same spot for both. This RFOB standardization is the key to GM engine swapping. Longer transmissions like the TH400 have the tailshaft end go rearward farther but the bellhousing is in the same spot as the TH350. Likewise the SBC and BBC. The bellhousing surface is in the same plane, but the front is farther forward on the BBC because it's longer.
I have prints that show the motor mount boss dimensions relative to RFOB aren't the same for BBC and SBC.

It's possible that aftermarket frame mounts are drilled incorrectly and this causes the misalignment, but without having one to compare to my gennie OEM's, I don't know.
There are many different brackets and it's possible to get the wrong two pairs installed.
They have left and right PN's. A BBC mount on one side and a SBC on the other might cause a misalignment. I seem to remember certain mismatched combinations causing issues if you have a mount for a "long" engine paired with a mount for a "short" engine.
(more later)

[Custom Jim]

I have to wonder if it was how it all was assembled and tightened down. Here's my thoughts. Let's say you bolt the motor mounts to the frame. The holes do not fit tight against the diameter of the bolt and have some slop. These are not closely toleranced parts. If the mounts were first put in place and all of the bolts started through the holes and then the nuts ran up tight the mount could be positioned just a tad off one way of the other. This one, two, or three degree twist might not seem like much and might allow the next part to be bolted to it but the farther away from the slightly twisted mount the further off other assemblies are to allow the remaining holes to be lined up and bolted together like back in the area of the tranny mount.
If it was mine I would try loosening all of the mounting bolts to get everything lined up and the bolts started with nuts on them finger tight and then tighten them all down and see how it is.
I've replace leaf springs before and while the front and rear parts all bolt in I sometimes have had to move the leaf springs by hand side to side to get them to line up properly in the saddles. I've also had some alignment problems with things like alternators but by getting all the nuts and bolts started and finger tight I can get it all together and all is well to tighten all the hardware down however if I don't do it this way I may find out the last bracket's holes do not all line up and a person could assume it's the wrong part even though it's not but by loosening some tightened bolts the assembly can be shifted and it all comes together.

Jim

[Pick]

I put a 400 in my '74. '74's never came with a 400, but I bought a GM TH400 crossmember from Chevy2Only, and everything lined up and bolted up just fine with my small block. WhenI first put the 400 in, I was using all stock mounts. I now have solid mounts, and it still lines up correctly.

[Paul Wright]

Here's a late night mock up. The digital lens distorts the image but the square showed the holes were aligned. The BBC cross bolt hole is raised vertically not offset to the pass side.
I think Jim has the most likely scenario. Loosen up the six frame bracket bolts and shift it into alignment.

[Toms73NovaSS]

EVERY (stock included) BB that I have ever seen in a nova with BB mounts the air cleaner centerline is visibly offset to the passengers side, why?

[69NovaSS]

this has turned out to be a really interesting thread...I suspect this issue will finely be sorted out once and for all...:cool:...:)

BTW I too will admit if it turns out I am wrong...(that should go without saying)

Paul....conventional wisdom would place the tall mount on the drivers side...if it doesnt also move the motor towards the passenger side how does that gain clearance...you would think just raising that side of the motor up would put the valve cover even closer to the power brake assist...unless of course the clearance their trying to gain is at the steering box and not the valve cover...hmmm...thats something I hadn't thought about before....

Also....if the motor isnt moved slightly sideways why is it that if you use SBC frame mounts when you install a BBC you can actually use the SBC heater core too as there is room for the hoses(its tight but I have seen pics of it before on this site) BUT when you use the BBC mounts the use of the SBC heater core is not, I believe, possible anylonger you need to switch to the BB heater core...whats changed?

[71SS]

HMM!! Interesting.
Here's a couple of links to Greg's research with Allen Cardo and Ron Bentz, on the BB Novas. Shows a good pic of the difference in the motor mounts and the crossmembers.


Nova Research Projects BB (http://www.chevynova.org/BigBock.html)

Nova Research Projects Crossmembers (http://www.chevynova.org/NovaCrossmember.html)

Everything I've learned about BB in Novas was that the engine and trans was shifted to the right.

[69NovaSS]

Offsetting the engine and transmission would cause a misalignment of the driveshaft.

Now this missalignment you are refering too would actually not be a problem as this exert from Hot Rod (the May of 1985 issue) will show(the article was on how to do engine swaps. pg.27)...the "right" way in illistration D is clearly demonstrating the offset we are refering too in the BB Nova's...Hot Rod says that if you have to have an offset that is the right way to accomodate it;) :)

http://i56.photobucket.com/albums/g180/1969NovaSS/driveline.jpg

[Paul Wright]

The Nova Research project has a lot of interesting pictures. I can't deny that in one picture I saw the Big block does look offset to the pass side. I'll do some more investigation and report back.

[bowtie0069]

I may have to order an OEM crossmember

When I went to the dealer to get a TH400 crossmember for my car, the Nova part was out of production; I ended up buying the Camaro part which didn't fit quite right--I had to slot all the holes because it was offset too far to work.

BTW, the small block in my car looks slightly offset to me.
My buddy built his out of 1" square tubing that sits in pieces of U-shaped tubing welded to the subframe--it's held with pit pins and makes it real nice when pulling the trans.

[Allen_396]

Everything that I've looked at indicates that the factory installed big block motors used mounts that shifted it slightly towards the passenger side. The purpose of that was to provide additional clearance for the exhaust around the steering box.

The shifting of the motor also necessitated relocating the heater core outlets toward the fender in order to avoid such a tight kink / fit of the hoses around the motor and into the firewall.

With the sideways shift of the motor, the big block transmission crossmember also had different locations for the mounting holes (compared to the regular one). There were actually three crossmembers available on the Nova.

1. BB with 4-speed
2. BB with Turbo 400
3. Everything else (4, 6, or SB V8 with a Torque-Drive, Powerglide, TH350, 3-speed manual, or 4-speed)

I have both a regular crossmember and a BB 4-speed crossmember in the parts pile I can take a picture of them together if you'd like to see the difference.


The same rules apply to the 67-69 Camaro due to the common firewall and subframe with the Nova.

[RatNova71]

Everything that I've looked at indicates that the factory installed big block motors used mounts that shifted it slightly towards the passenger side. The purpose of that was to provide additional clearance for the exhaust around the steering box.

Absolutely!

I can attest to this one. When i did my BB transplant in my car i knew nothing of the offset.

I also did not use factory mounts. I used late model "clamshell" mounts and drilled new holes in the frame to make them work. I installed my engine on centerline. like i said i didnt know about the offset.

My clearance to the steering box is very tight to my exhaust manifold. I installed the motor w/o manifolds on it and i had to jack up the motor to get the driverside on.

On the passenger side I had enough clearance to use the SB heater core, but i have since switched over to a BB unit because it rotted out.

I have a TH350, so the trans crossmember was not an issue. I reused my PG crossmember.

So, it all fits like this but there is no way the factory could have installed the engine/trans with manifolds attached without the OFFSET. :cool:

[69NovaSS]

Bump!!!!

I was wondering if this issue been looked into anymore and if so is it offset or not???:confused:

[Nova_Guy]

Same style headers mine has SBC mounts the other uses BB
http://i35.photobucket.com/albums/d189/jasonchale/2005_1028Image0008-1.jpg

http://thumb15.webshots.net/s/thumb4/0/15/28/101301528fnowxe_th.jpg (http://rides.webshots.com/photo/1101301528045202495fnowxe)

[bwilli1959]

This is NOT just buy the BB frame mounts and throw it in. I read all the posts about how simple this was. It isn't. If you have 68-72 sure it is simple but NOT 73-74. I am actually doing this and I would not advise it to anyone unless you can fabricate frame mounts and a xmbr and weld. After two weeks trying everthing and searching the internet I finally gave up and sent mine to a chassis shop. Yes I bought the BB frame mounts and the TH400 xmbr and no it is not bolt in and go. It is not even move the mounts and drill holes or weld the frame mounts. Yes I got the so called correct mounts and yes I put them on the correct sides yes I tried the stock clamshell mounts, believe me, I tried everything and more.

[Toms73NovaSS]

That is unfortunate..

I have a 73 and I had no problems with the correct upper and lower frame mounts.

I did have to slot the rear trany crossmember (original powerglide), and put in a bb heater core. Otherwise it wasn't that bad.

Maybe 74 is different....

http://i21.photobucket.com/albums/b259/tjkoprevich/engine2.jpg

http://i21.photobucket.com/albums/b259/tjkoprevich/headers.jpg

[Custom Jim]

I bought a 73 hatchback a few years ago without the motor in it and it had a manual 3 speed still in place. I bought a 454 from a buddy to mock up the headers and another buddy gave me his mounts off of his big block 72 that he had bought from GM years ago and it went right in. No muss, no fuss. I didn't even have to move the tranny from it's tailshaft mount.

I wonder where it went wrong with yours ?. It seems like you've tried the different combo's. Maybe a mislabeled/wrong part ?

Jim

[Real McCoy]

We have put BB in all sorts of Novas up to a 77 and never had any major issues. We even stuck a couple 500 inch Caddy motors in them. Not sure what you're issues were but it hasn't ever been a big deal for me and my buds in the past. RM

[Nova_Guy]

I reused the SBC frame mounts a set of solid Moroso engine mounts. The same ones from the SBC, that I had in the Nova and my 70 Camaro. Mine dropped in like it came from there. The 3rd gen cars vary quite a bit in the way things bolt up from I have read about.

[RatNova71]

This is NOT just buy the BB frame mounts and throw it in. I read all the posts about how simple this was. It isn't. If you have 68-72 sure it is simple but NOT 73-74. I am actually doing this and I would not advise it to anyone unless you can fabricate frame mounts and a xmbr and weld. After two weeks trying everthing and searching the internet I finally gave up and sent mine to a chassis shop. Yes I bought the BB frame mounts and the TH400 xmbr and no it is not bolt in and go. It is not even move the mounts and drill holes or weld the frame mounts. Yes I got the so called correct mounts and yes I put them on the correct sides yes I tried the stock clamshell mounts, believe me, I tried everything and more.

I think the only diff in a 74 front subframe from a 68-72 is the holes drilled for the front bumper brackets. I am sure it is something simple that you have overlooked because there are plenty of BB 73-74s running around out there.

Let us know what u find out.

[450HP]

From my understanding, the 73/74 Nova subframes are a bit different.

About the only differences is where the steering box is located...

IIRC, all prior Novas were front steer where the 73-79 Novas are rear steer.

But, the only real problem that introduced was being a real pain for headers.

Course, this is how my forty year old brain remembers it... :D

Scott

[Toms73NovaSS]

Course, this is how my forty year old brain remembers it... :D

Scott


Hey scott,
time to go to the doc's for a checkup!! 75-79 were front steer. 73-74 are still rear steer. Take a look at my pic up top. ;)

[450HP]

Hey scott,
time to go to the doc's for a checkup!! 75-79 were front steer. 73-74 are still rear steer. Take a look at my pic up top. ;)

I knew it was one way or the other... couldn't remember which way tho... :rolleyes:

But I had thought that the 73/74 Novas were the same as the 75-79 tho... thought
that's were they got the nickname "the ba$tard Novas" because they were right in
the middle of a change over period.

Well, guess what... I'm wrong again! :D

By the way Tom, that's one gorgeous Nova you have! :D

Scott

[bwilli1959]

I figured I would get some replies about how simple this was and I must be doing something wrong. But if that is true then answer me these ... and someone that has done this .. not had it done, what frame mounts did you use, where did you get them, what engine mounts did you use, did I mention that I am also using a TH400 tranny and originally had a TH350. I bought the BB mounts, the ones that end in 113/114 I bought a xmbr (actually two of them from different sources) that are supposed to be for this conversion.

I have $400 in useless mounts and xmbrs and now am facing who knows how much to get custom mounts built and installed.

If someone has the specifics for this not just "search the site we have covered this" as I have seen posted .... then I would love to hear from them. Specific to a 74 454/TH400

Thanks all for the replies

[Real McCoy]

I don't know what mounts I used and it's been well over 20 yrs ago but I can tell you this, I didn't spend any big money to install a BBC in them and I didn't do alot of fab work either. I don't know why you had all those problems but it is normally not a big deal to do. The Cady motors were worse than the BBC and they only took a couple days to install.

[bwilli1959]

Real Mccoy, if whoever "we" is actually did this specific conversion the "we" would know. Hey I can put a caddy motor or anything else in there if I want to build the motor plates or mounts. That is the typical stuff I saw posted about this conversion. Just velcro that baby right in there, no problem. Over 20 years ago .... I mean why does someone like you even respond to this post. I guess it makes you feel superior to say you can just whip this right in there and I must be stupid. Whatever ... thanks for nothing.

[Real McCoy]

Well Bwilli1959 I never once said you were stupid or even implied that. I posted so others who may want to do this swap won't be scared off by your post because it normally is an easy swap like I and so many others have posted. At 59 I don't recall the specific parts I used 20 some years ago. If you had problems doing this swap I have no idea why but don't get pissed at me cause you couldn't do it. It's not my fault. My swaps went smoothly. I hope you figure out why you had problems cause I'll not be attempting to help you. RM

[americangraffiti]

Well Bwilli1959 I never once said you were stupid or even implied that. I posted so others who may want to do this swap won't be scared off by your post because it normally is an easy swap like I and so many others have posted. At 59 I don't recall the specific parts I used 20 some years ago. If you had problems doing this swap I have no idea why but don't get pissed at me cause you couldn't do it. It's not my fault. My swaps went smoothly. I hope you figure out why you had problems cause I'll not be attempting to help you. RM
Ditto.........

[the FLYER]

Real Mccoy, if whoever "we" is actually did this specific conversion the "we" would know. Hey I can put a caddy motor or anything else in there if I want to build the motor plates or mounts. That is the typical stuff I saw posted about this conversion. Just velcro that baby right in there, no problem. Over 20 years ago .... I mean why does someone like you even respond to this post. I guess it makes you feel superior to say you can just whip this right in there and I must be stupid. Whatever ... thanks for nothing.

a word to the wise... yer a newbie... untill ya get an idea of how this forum works, take it easy. the guys are here ta help and WILL try ta help ya... no one here is here ta put ya down but yer response asks for negative replies...


take it easy and calm down...


or you'll find the welcome mat pulled out from under ya and you'll find yerself Outside looking in... IF ya get my meaning ;)


be cool and be treated cool... act like a pain and receive the same in return...








Johnny ;)

[Nova_Guy]

I'll be nice. I did the swap as a 19 year old by myself. If I would have had a place like this to answer questions I would have been in heaven.
http://www.stevesnovasite.com/forums/showthread.php?t=36449&highlight=swap
http://stevesnovasite.com/forums/showthread.php?t=31710&highlight=conversion
http://stevesnovasite.com/forums/showthread.php?t=32542
http://stevesnovasite.com/forums/showthread.php?t=30598
http://stevesnovasite.com/forums/showthread.php?t=32491
http://www.stevesnovasite.com/forums/showthread.php?t=46588&highlight=block
http://www.stevesnovasite.com/forums/showthread.php?t=38015&highlight=block
http://www.stevesnovasite.com/forums/showthread.php?t=28203&highlight=block

[americangraffiti]

a word to the wise... yer a newbie... untill ya get an idea of how this forum works, take it easy. the guys are here ta help and WILL try ta help ya... no one here is here ta put ya down but yer response asks for negative replies...


take it easy and calm down...


or you'll find the welcome mat pulled out from under ya and you'll find yerself Outside looking in... IF ya get my meaning ;)


be cool and be treated cool... act like a pain and receive the same in return...








Johnny ;)


Ditto.................

[NIGHTSHADE]

Real Mccoy, if whoever "we" is actually did this specific conversion the "we" would know. Hey I can put a caddy motor or anything else in there if I want to build the motor plates or mounts. That is the typical stuff I saw posted about this conversion. Just velcro that baby right in there, no problem. Over 20 years ago .... I mean why does someone like you even respond to this post. I guess it makes you feel superior to say you can just whip this right in there and I must be stupid. Whatever ... thanks for nothing.

So is it their/our fault that you can't seem to figure it out?

[bwilli1959]

This IS a difficult swap. I know because I am actually doing it right now. If anyone can answer my questions then I would be thrilled and appreciative. If not that is fine too. I posted this for the specific reason to let people know that this is not a bolt in swap and hopefully they will not waste money on the parts that I bought that are advertised specifically for this swap. I refrained from naming the suppliers publicly in the post but if someone asks I will tell them.

[Toms73NovaSS]

I dont mean this as a slam. But this IS a easy swap compared to other conversions that I have done in the past. Mostly Bolt in.

I did it last summer. I believe that I got my base frame mounts from classicmuscle. I used the energysystems narrow and tall urethane engine mounts. Yes I have a th350 not a th400 but I know several others in my area that have purchased the 400 trany mount from different suppliers and they all worked.

I converted my heater box drilled holes for the bb heater core and fabbed a foam retainer.

Also, all the motor mount parts were for 70' nova

[1970 Nova Yenko]

Will the stock Auto crossmember from a TH-350 car work with a TH-400? This is a great site everyone is so helpful!!

Chris

[66marinabluess]

Nope, you'll have to get one for the 400 trans. You can get one at just about anyplace that sells Nova parts.

[Pick]

Bought my TH400 crossmember from Chevy2Only. Several other places have them as well.

[jlowery78]

I have 1 question. So Will the small block frame mounts work on a big block? Or do I need to buy the big block frame mounts? Installing a 454 in a 69 nova. Thanks

[Novaddiction]

I would say you need BB mounts and the correct crossmember. Just my .02

[Pop-A-Top]

jlowery78:

I recently had a BB installed in my '69. It originally had a 350. I had purchased BB frame and engine mounts for the mechanic to use in the conversion. He said he COULD NOT get things to fit right with the BB mounts that I had provided. He solved the problem by putting the original SB frame and engine mounts and only then was he able to gain the clearance needed for the manual steering gear. This is contrary to most people's experience but nevertheless, that's how it went down.

[72ss427]

It's true that the BBC frame mounts differ from the SBC mounts. When I put a BB in my 68 Camaro for drag racing I used the small block frame mounts and the Moroso small block motor mounts, only because I didn't know any better. I had no fitment problems with anything but the lakewood can hitting my throttle arm and that was only because of the tall lip. Everything else fit right in place, hooker super comps, as well as the clutch Z bar. I wonder if it even matters. And NO the trans mount is not offset. I know this because I am extremely anal about things being centered and straight. I had everthing centered in the frame with no problems.:yes: