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no I mean the thing that the ringgear bolts to, in the rear this would be the gov locker and front it would be the part with the spider gears.

well if you could swap in a 4l80e (this is a turbo 400 with an overdrive) you would need a computer wired in to make it work, there are some company's that make stand alone computer modules to tell the trany when to shift,"the E in 4l80E stands for electronic" but I am not sure of the cost...

with a three speed auto third gear is a 1 to 1 ratio which means the transmision output roughly matches the engine rpm, (engine @1000 rpm the tranny in third gear will be spinning the driveshaft @1000rpm) the optimal engine rpm for the 6.2 diesel at 60mph should be between 1800 to 2800rpm...

If by 4speed you mean 4sp. auto then yes you can swap in a 4l80e or 700r4, I have often pondered this myself when I got my truck, here what I concluded, the turbo 400 you have in there now is a pretty stout auto used for heavy duty applications, this 3 speed combined with 4.56 diff gears makes...