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Fact of the matter is an Allison robs so much horse power that it's a bad idea. That's why sled runners swap in a 4L80E. A TH400 is extremely strong. If you think Allison doesn't use any more HP to operate than a 4L80E or TH400 then your dreaming! But go ahead and do the swap. You have been...

You really don't want a Allison Transmission. They eat up about 40 to 50 up just to work. In other words they rob you that much power. A popular swap into the Duramax is the 4L80E. Tough as nails and doesn't Rob you tons of horse power! They can be bolted to a 6.5 6.2. There are a bunch of...

Here you go: GM 93-94...................... 95/up GM; 93/up Dodge First Gear6.34 .................5.61 Second Gear3.44............. 3.04 Third Gear1.71................ 1.67 Fourth Gear1.00 ...............1.00 Fifth Gear0.73 ..................0.73 Reverse6.34 .....................5.04

You also get a taller over drive .73 and a lower first 6.43 or the 5.41 depending on which year the GM NV4500 is. Either way its a pretty staright forward swap. No need for a body lift either. Those ratios I quoted are close. I dont recall of hand without going to google.

Why not a NV4500? As long as your not going to be towing anything very large you would be better off with the NV4500. GCVW 14,000.