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Allison gear ratios

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hey gang. Picking up my 06 2500HD regular cab long bed 4x4 with the 8.1L and Allison six speed auto.


I wanted to see if anybody had info on the tranny as far as the gear ratios that are in it. The truck is coming with the 4.10s and was curious what the two overdrives are rated at.


I know that the 4L60E has a .70 overdrive, the 4L80E, not sure.


Went to the Allison webpage and didnt see what I was looking for.


The truck color is dark blue metallic.




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thanks partner. can i ask where you got that info so i can take a look see deeper into the tranny?


i go and pick up the truck tomorrow. to say that im a kid excited at christmas time would be an understatement. wife doesnt get it...why do i need a bigger truck, with a bigger engine and transmisison, one that sits higher and rides rougher?


must be a guy thing?? i love my 87 K20 more than my 03 Sierra that i had.



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I've got the 05 shop manual for my Allison and this list and others have discussed the 0.61 sixth gear a bunch.


For the record :


1 - 3.10:1

2 - 1.81:1

3 - 1.41:1

4 - 1.00:1

5 - 0.71:1

6 - 0.61:1

R - 4.49:1



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