I had a 92 s10 pick-up w/ a 4.3L v6, a 3.08 rear gear, & a th700r4 tranny. I put a gear vendors OD in it, the engine could handle the low rpms ok. With a couple other mods it would get up to 34mpg on a hot summer day. I took it out of the truck when I got rid of it (getting rusty), I did some mock up w/ the GV to put it in my 84 Corvette. It clears the tunnel but I'm working on the mount for it. The C4 corvette use a c beam from the rear diff to the tailshaft of the trans, so you can see what challenges I have.
To handle extremely tall gearig your vechicle needs to be light & areodynamic or have a real torquey engine.
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