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post #1 of 19 (permalink) Old 04-21-2008, 01:44 AM Thread Starter
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Question Gearing with a lift

So Ive heard the gearing in the differential is important for power and fuel economy. Can anyone explain this to me and/or tell me if I should be paying to have mine changed. I have an 08 CM 5.7L with a 6" procomp lift...20" wheels and 35s. Thanks in advance!

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post #2 of 19 (permalink) Old 04-21-2008, 10:04 AM Thread Starter
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Bump for response!

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post #3 of 19 (permalink) Old 04-21-2008, 10:53 AM
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This chart may help

4Lo.com :: Gear Ratio & Tire Size Chart

I don't know is an aftermarket ring and pinions are out yet


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post #4 of 19 (permalink) Old 04-21-2008, 11:51 AM
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It's harder for the engine to turn a taller tire with a given gear ratio. The final gear ratio is what gives the engine leverage to turn the wheels. The 4.30 ratio needs to be changed to 4.70, with 35" tires, to give the same mechanical leverage the 4.30 ratio had with stock 32" tires. Even if you could change to a 4.70 ratio, that wouldn't compensate for the extra weight of 20" wheels, the heavier 35" tires and the extra weight of the 6" lift components. With the taller tires and all that extra weight you may need something like a 5.30 (?) ratio to get back to the same mechanical performance as stock.

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post #5 of 19 (permalink) Old 04-21-2008, 04:35 PM Thread Starter
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It's harder for the engine to turn a taller tire with a given gear ratio. The final gear ratio is what gives the engine leverage to turn the wheels. The 4.30 ratio needs to be changed to 4.70, with 35" tires, to give the same mechanical leverage the 4.30 ratio had with stock 32" tires. Even if you could change to a 4.70 ratio, that wouldn't compensate for the extra weight of 20" wheels, the heavier 35" tires and the extra weight of the 6" lift components. With the taller tires and all that extra weight you may need something like a 5.30 (?) ratio to get back to the same mechanical performance as stock.
Thanks for the reply....are we talking an expensive mod?

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post #6 of 19 (permalink) Old 04-21-2008, 04:39 PM
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Thanks for the reply....are we talking an expensive mod?
Kind of do you have 2WD or 4WD. 4WD is twice the money


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post #7 of 19 (permalink) Old 04-21-2008, 04:41 PM Thread Starter
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Kind of do you have 2WD or 4WD. 4WD is twice the money
i have 4wd...maybe they will give me a discount if i promise not to use it

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post #8 of 19 (permalink) Old 04-21-2008, 04:44 PM
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Originally Posted by 08CMAX View Post
i have 4wd...maybe they will give me a discount if i promise not to use it
Loose the front drive shaft. BAM 2WD


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post #9 of 19 (permalink) Old 04-21-2008, 04:46 PM Thread Starter
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Originally Posted by jpnca View Post
Loose the front drive shaft. BAM 2WD
Actually i just hit a low gear with the 5.7L for a wheelie... only using 2 wheels on the ground! LOL

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post #10 of 19 (permalink) Old 04-21-2008, 05:10 PM
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then maybe you need a turning break


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post #11 of 19 (permalink) Old 04-21-2008, 05:38 PM
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Originally Posted by 08CMAX View Post
Thanks for the reply....are we talking an expensive mod?
Compared to what.........the 20's, the 35's and the lift?

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post #12 of 19 (permalink) Old 04-21-2008, 07:49 PM
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Thanks for the reply....are we talking an expensive mod?
My little bro had his 06 4wd Tundra with an 11" lift and 37" tires regeared for $900.
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post #13 of 19 (permalink) Old 04-22-2008, 01:41 AM Thread Starter
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Talking

What good is my $5k supercharger gonna be without proper $900 gearing! LMAO! Oh well.....I need do it! And yes I said "need!"

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post #14 of 19 (permalink) Old 04-24-2008, 07:03 AM
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There are no gears available yet... one could speculate some of the Hino light trucks might have some parts that would fit. That will only cover the rear diff, though.
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post #15 of 19 (permalink) Old 04-24-2008, 10:09 AM
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My little bro had his 06 4wd Tundra with an 11" lift and 37" tires regeared for $900.
$900... is that with the gears and the install? If so thats a pretty good deal.

Last edited by apimpdad; 04-24-2008 at 10:13 AM.
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