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Old March 13th, 2013, 06:03 AM   #1
rubiconwrangler
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Best axle gear ratio for chevy 350, TH350, 33" tires.

Its actually in a jeep but I figured id ask it here because of well being a chevy drivetrain.
Those of you running a TH350 or other auto trans without lockup convertor or overdrive, whats your axle gear ratio and how does it do onroad and ocassional offroad?

I have 4.10 now and when running at 70 its at 3,200 to 3,300 rpm.

Im making the truck my daily driver soo i want better on freeway but still want some performance.

Im doing a 8.8 axle swap now and in a few years when my tires wear down (there still like new now) ill probably be going with some 35's.

Soo whats your thoughts on this setup should I go with 3.55 or 3.73
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Old March 14th, 2013, 03:57 PM   #2
Iggy
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Years ago my brother ran a 327 in a CJ7 with a TH350 and it had 3.42 gears and 33" tires. He used as a daily driver and wheeled it, fuel mileage was good and he never complained about power.
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Old March 14th, 2013, 04:24 PM   #3
joe_jeep
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3000 rpm 3.55 is 79 mph
3000 rpm 3.73 is 74 mph
2500 rpm 3.55 is 65 mph
2500 rpm 3.73 is 62 mph

probably 3.55 is a good for you in my opinion.
3.23 or 3.42 would be great, but i dont think those are an option in the 8.8
google gear ratio calculator the first one is "grimm jeeper"
you can play with all kinds of number there.
you would like to be between 2500 and 2750 at hiway speed imho.
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Old March 16th, 2013, 03:40 AM   #4
rubiconwrangler
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Ok thanks.
Im thinking since I have 4.10 now i would be almost pointless to go to 3.73 thats not much of a difference.
soo im thinking im going to go with the 3.55, got the bracket kit in the mail yesterday, now just to cut one out of a truck at the junk yard.
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Old March 16th, 2013, 08:51 AM   #5
bdd1469
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Sell your tires, buy some 35s.
Find a 8.8 with 4:10 ( very popular)
done.
Tires are exspensive but very sellable used. I can buy a 4;10 8.8 complete for $89.
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Old March 16th, 2013, 01:42 PM   #6
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^
true
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