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Discussion Starter #1 (Edited)
I need to know how bad this approach is. I will be spending toooo much money on engine parts in the next couple of months so I would like any options on welding rear gears for the mean time. I spoke to a racing shop about the parts I am buying and when I said to him "What about my gears? Not posi". He said weld them for now. We do it all the time.
Can this be bad or just bad when it breaks?
 

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When it breaks it can do damage to the rear and with welded spider gears going around corners will always chirp tires because there is no slippage between the axles. I would say save your rear and run it without a posi for now. No sense doing it half *** and ruining something because you cant wait to have a posi. Then you will be in for more than just a posi unit when the spider gears break and leave metal everywhere.

Just my opinion though. My dads has know people who have done it and they always break eventually.


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Yes it can be done, I've done it for people with a big fat NO WARRANTY stamped on the work order. You will want to weld the 8 corners where the 4 spider gears contact each other. You will want to make sure you get good penetration.

Miles
 

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everybody is a "ricky-racer" once their Hotrod is on the road... seems everyone pushes it from time to time. all you need to do is get crazy hard on your car once and grenade the differential and you'll kick yourself in the butt for welding the gears. it's the cheap, mickey-mouse & INCORRECT way of doin' it...
 

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Discussion Starter #8
everybody is a "ricky-racer" once their Hotrod is on the road... seems everyone pushes it from time to time. all you need to do is get crazy hard on your car once and grenade the differential and you'll kick yourself in the butt for welding the gears. it's the cheap, mickey-mouse & INCORRECT way of doin' it...
No I just figure if I can do so once I have the new motor in place I can feel the difference. I am not a crazy driver nor a newbie. I can hold my own while noticing such difference. I don't go to tracks, I don't go to illegal street races, I don't even burn tires on every stop light.
I just accelerate here and there where I know is safe.
I could burn some good tires with my 307 but it does not pull me the seat.

I understand everyone's opinion but even on my rebuilt 307 I don't feel much difference since I don't have a posi rear. It sucks man.
I just feel that once I place the new motor I can just do this for another 6 months until I get the posi unit.
Besides it was a suggestion from a vendor not something I envision.
 

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No I just figure if I can do so once I have the new motor in place I can feel the difference. I am not a crazy driver nor a newbie. I can hold my own while noticing such difference. I don't go to tracks, I don't go to illegal street races, I don't even burn tires on every stop light.
I just accelerate here and there where I know is safe.
I could burn some good tires with my 307 but it does not pull me the seat.

I understand everyone's opinion but even on my rebuilt 307 I don't feel much difference since I don't have a posi rear. It sucks man.
I just feel that once I place the new motor I can just do this for another 6 months until I get the posi unit.
Besides it was a suggestion from a vendor not something I envision.


Good luck with it. After turning enough or the wrong acceleration they will break.*

Also think about it. A posi only gets power to the ground. What throws you back in your seat is gear ratio. 4.11 gears without a posi is the same as with it. It is still good acceleration. A posi will just keep the tires on the road a little better off hard dead stop acceleration. You really only need the posi if you are accelerating hard from a stop. If you just like pushing it some while your going then a posi won't make a difference in pushing you in your seat.*

Do what you want to do because it sounds like you already have your mind made up, but try to take in what people are saying here. There really are not split decisions on this. Everyone seems to agree its not the right way to do it.




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No I just figure if I can do so once I have the new motor in place I can feel the difference. I am not a crazy driver nor a newbie. I can hold my own while noticing such difference. I don't go to tracks, I don't go to illegal street races, I don't even burn tires on every stop light.
I just accelerate here and there where I know is safe.
I could burn some good tires with my 307 but it does not pull me the seat.

I understand everyone's opinion but even on my rebuilt 307 I don't feel much difference since I don't have a posi rear. It sucks man.
I just feel that once I place the new motor I can just do this for another 6 months until I get the posi unit.
Besides it was a suggestion from a vendor not something I envision.
Have you already built you're 307 or you are going to? RICK
 

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Discussion Starter #13
Good luck with it. After turning enough or the wrong acceleration they will break.*

Also think about it. A posi only gets power to the ground. What throws you back in your seat is gear ratio. 4.11 gears without a posi is the same as with it. It is still good acceleration. A posi will just keep the tires on the road a little better off hard dead stop acceleration. You really only need the posi if you are accelerating hard from a stop. If you just like pushing it some while your going then a posi won't make a difference in pushing you in your seat.*

Do what you want to do because it sounds like you already have your mind made up, but try to take in what people are saying here. There really are not split decisions on this. Everyone seems to agree its not the right way to do it.

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Dude where in here it indicates that I have my mind set up on doing this. If you read my initial post you can see that it was a recommendation from a racing shop and not my proposal to a new upgrade. I just figure it was a temporary solution to one of the missing links. If you see I posted so searching for logical answers.
I think it may leave me stranded somewhere in the Poconos, PA probably. I don't know. It is risky business no matter how you look at it.
 

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If it was my car I personaly would update all the safety features on the car if you haven't already done so. And do the new diff last or there abouts. Just my 2 cents. RICK
 

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Discussion Starter #15
Have you already built you're 307 or you are going to? RICK
My 307 is being built for some time now. That is what I have on my car and that is the motor it came with. It feels good but I know I am loosing power due to lack of gears.
Why you asked?
 

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Discussion Starter #16
If it was my car I personaly would update all the safety features on the car if you haven't already done so. And do the new diff last or there abouts. Just my 2 cents. RICK
What do you mean by safety features?
The only thing I don't have which I need to fix is the seat belts. Since I upgraded from bench to bucket seats I have not being able to figure which direction to go with. Other than that I have done everything else. At least I feel like it.
 

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The 307 isn't the most powerful motor chevy ever made. There really isn't any replacement for cubic inches. It's hard to get you pinned agaisnt the seat with 307 even with 411 posi in the rear. RICK
 

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If it was my car I personaly would update all the safety features on the car if you haven't already done so. And do the new diff last or there abouts. Just my 2 cents. RICK
Same thing I have been doing to mine. I built and installed the 383(500-520hp), replaced rear bushings with poly ones, solid u-joints, subframe connectors, rebuilt frontend, etc.. Now I have Moser 30 spline axles, 4.10 Richmond gears, bearings, studs, and support cover. Now I need an Eaton posi and I will be done.
 

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Discussion Starter #20
The 307 isn't the most powerful motor chevy ever made. There really isn't any replacement for cubic inches. It's hard to get you pinned agaisnt the seat with 307 even with 411 posi in the rear. RICK
No I am building a 350 4 bolt main. And that is what I mean by putting new engine. The 307 runs good I have to tell you but when I install my new 350 I want to feel it specially a 4 bolt main bored.
 
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