im'ma just do some math here, because i'm curious about this myself:
T56(no model specified, so i'll assume a 95ish LT1 F-body unit for gearing purposes):
NV4500(i'll assume another 95 unit, MT8 RPO):
it's too bad the graph function isn't working at the moment.... it's nice to visualize it as well.
but those are with the same 4.88 gears(and 28" tire). as far as the highway(55MPH) is concerned, 5th in both is 2350-2400 RPM, but the T56 has the option of 6th gear when possible, RPM would drop to just over 1600.
to match the same RPM as the T56 6th gear, the NV4500 would need to use 3.35 final gears. i don't know if this is realistic/normal or not.
anyways, from a purely mathematical perspective..... the T56 gear spacing is VERY nice, has fairly consistent ratio changes, which would certainly help keep the engine in its powerband at any time. the NV4500: not so much. shifting at 3000 will land you anywhere from under 1500 to 2200 in the next gear. some gears, you would need to wind it out a lot further than others to keep the engine from dropping to too low of a speed in the next gear.
as far as the hardware holding up, i won't speak of it, neither the T56 or the NV4500 is anything i have experience with nor knowledge of. i'm much more interested in seeing how to stuff a T56 into a 4WD S10 chassis with a heavily boosted V6 in front of it for my personal use.
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