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The 6spd was weak back thenI still own my 99 NV 4500 5 and. Wish i had the available 6 speed...but doesn't change the fact in 1999 the only available automatic was a 4sp
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You can see the 5 spd there...but they didn't use it.
It is funny though as in the 90s the manual transmission got you more power in the Cummins and V10...and then in the 4th Gen the manual got the detuned version.
Amazing what people giving up the 3rd pedal has done for automatic tranamissions
I would be more concerned that a Chrysler 9.25 and Dana 44 could handle 800 ft-lbs and 35in tires