I have a 500 cad in my 85 chevy 4x4 plow truck. with 3.08's and 31" tires it cruises at 2200 at 60mph.. If you wanna do it, you won't be sorry.. The 75 50 I have is listed at 400 ft.lbs at like 2000 rpm.. When I crack the secondaries in a 5000 pound 4x4 at 60mph it sets you back in the seat. Torque rules!! Don't go any higher then 3.23's and you'll be VERY happy! The big caddy prefers to lug against a high gear ratio.. A friend put a built 500 caddy in a malibu and overgeared it with 3.42's.. Didn't feel much better then a built small block.. He later put it in a truck with 3.08's and it scared the crap outta him!
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