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Old 05-01-2008, 11:38 AM   #7 (permalink)
Michael_S
6.2 Liter LS9 Supercharged V8
 
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Join Date: Jul 2004
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Re: 8.1L & 4L80E/4-L85E Transmission

Quote:
Originally Posted by mikennina View Post
now for 08 they did put the 6L80E in the 3/4 ton but still with the 6.0L now at 352HP but has a 3.42 gear with no option.
But you have to look at the gears inside the transmission.
If I remember right, the 4 speed automatic had 3.04 first, 1.57 second, 1.00 third, and 0.68 fourth gear. If you add in a 4.10 final drive, your total gear multiplier to the wheels is:

12.46 in first, 6.44 in second, 4.10 in third, and 2.79 in fourth.

The 6L80E first four gears are: 4.03, 2.36, 1.53, and 1.15. Multiplied by a 3.42 final drive, and your total gear multiplier to the wheels is:

13.78 in first, 8.07 in second, 5.23 in third, and 3.93 in fourth.

The 6L80E with a 3.42 puts more torque to the ground than the 4L80E with a 4.10.
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