Rear End Gear Ratio Recommendations - Chevy Nova Forum
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Old 9th-May-2011, 11:04 AM   #1
MAN - GA
 
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Rear End Gear Ratio Recommendations

I have a 73 Nova with 350 engine and TH350 trans. Engine is stock with the exception of intake and carb upgrades. The current axle ratio is 2.73" in the stock rearend. I drive the car daily so I want to have some kind of economy mind and am wondering what most folks recommend for a daily driver. I am thinking about 3.42 or 3.55. I don't really drive over 50mph or on the highway with the car and based upon the tire diameter I see right at 2,000rpm presently at 50mph

I just don't want to go to a 3.08 and not get much out of the upgrade

THANKS
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Old 9th-May-2011, 11:09 AM   #2
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The 2.73's, although dog gears, will give you the best fuel economy, that's why they're called "highway" gears.

If you are looking for better fuel economy you'll have to swap out your transmission for an overdrive unit like a 700R4.
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Old 9th-May-2011, 01:21 PM   #3
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My rear end looks like the middle picture in the attached web link - it has the bottom lugs, but the cover is like the picture on the left for the 8.2" style. I am assuming the covers were interchangeable, but is there some reason the high left to low right reveal is on the right side of the cover?

http://www.novaresource.org/axle.htm
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Old 9th-May-2011, 01:29 PM   #4
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if 55 mph cruise is all you care about.

3.55-3.73

Al
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Old 9th-May-2011, 02:09 PM   #5
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the covers do interchange and there are several designs. You have an 8.5 and the ratios 3.08, 3.23, 3.42, 3.73 would be the range to stay in for your application.

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Old 9th-May-2011, 02:42 PM   #6
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I put 3 73s in mine and kind of wish I went with the 355s same basic set up as yours. If I could do it again 355s for me.
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Old 9th-May-2011, 03:14 PM   #7
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Yeap 3:42 or 3:55 for what you are wanting to do. As long as your rearend is factory than like said it would be an 8.5 rearend. Good luck with it
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Old 23rd-August-2011, 05:52 PM   #8
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not trying ot steal your thread but i also need help with rearend gears. i've got a 74 with an 8.5 and i believe 3.08's right now. i've got 295 65 15 tires on a 10 inch wheel so my car pretty much doesn't move until it's halfway through second gear. Any idea on what gear ration I should go with? I was thinking 3.73's since I don't get on the freeway much. Any help would be greatly appreciated
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Old 24th-August-2011, 07:21 AM   #9
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Gears

Quote:
Originally Posted by Theonlyxero View Post
not trying ot steal your thread but i also need help with rearend gears. i've got a 74 with an 8.5 and i believe 3.08's right now. i've got 295 65 15 tires on a 10 inch wheel so my car pretty much doesn't move until it's halfway through second gear. Any idea on what gear ration I should go with? I was thinking 3.73's since I don't get on the freeway much. Any help would be greatly appreciated
With tires that tall (about 28.5-29"), I'd go with at least 3.90, more likely 4.10's. Highway speeds with 4.10's would be fine without being at too high an rpm.
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Old 24th-August-2011, 09:54 AM   #10
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Quote:
2,000rpm presently at 50mph
Unless you run 23" tall tires or have a lot of converter slip, I'm guessing you have more than 2.73's.
Figuring in a 26" tire, 2000 RPM sounds more like 3.08's with no slippage.
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Old 27th-August-2011, 05:28 PM   #11
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3.42 is a nice ratio if you're running a "standard" size rear tire.
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Old 27th-August-2011, 10:30 PM   #12
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3.42's are good gears for performance and some highway driving but don't be so quick to condemn 3.08's I've seen a lot of cars run pretty good with them. Depends on the type trans you're running too. With a Turbo 350, 3.08's will surprise you as far as performance . You will definately notice a difference from your 2.73's.
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