Hey Notstock,
A lot of the trucks I see have about 3.73:1 gears in them, and they always have 9- or 10-speed trannies with overdrive in them. Without overdrive you would probably need 3.17 gears just to have the same final ratio as with 3.73's AND overdrive. Having said that, 3.58 gears and an O/D trans would "relax" the engine a bit pulling the lighter load you'd have with your conversion. Without the O/D trans, you might look at about a 3.08 gear to get the same final ratio. Now, with ALL that said, I've heard of guys using a 3.08 gear WITH an O/D trans. Talk about long legs! Anyway, I hope this gave you enough stuff to mull over about your future rig! (kinda fun, huh?)
Gary
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