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Both trannies came with 3.92 rear gears, but with the 33" tire option and 20" wheels that equated to a 3.55 rear end. *Most trucks that I've seen came with that 3.55... 'cuz 20s sell better, I think. If I swap in one of those 6speeds, I'm putting some taller gears in the rear to get the 6th ratio closer to that of the auto's 5th.
Now RAM puts a 3.21 gearset in the trucks; auto gears are the same but the new trucks are better aerodynamically.
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