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thanks for trying to 'learn me' on the transmission that i have in my truck. it has the GM short, fixed yoke tail: this means there is no 'slip-yoke wobble' (?) and no main shaft or 5th gear issue. and since i bought the clutch, i'm also pretty sure that i know what size input shaft it has...

my nv4500 is also cast iron also. it was rebuilt for $1600 w/ american made parts (readily available) and still got a $500 core charge. upgraded input shaft costs a few hundred bucks. so i'm not sure where you get your parts from, but sounds like you may get ripped off alot.

you're lost if you think that the deuce spicer 3053 will hold more power than an nv4500, zf6, or nv5600. keep dreaming if you have any more than mild small block power through this transmission.

sounds like 9 sets sold? :D

even with near-stock tires, i don't think the stock motor will have enough cohone's to run a 3.38 final drive (0.69x4.90).

:ditto: i believe this is perfectly stated, especially the part about your engine's power band relating to the desired operating speed.