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For overdrive options, I'd use an A-500 instead of a 518 in his case. A properly prepped A-500 will take the power, is lighter, and takes less power to operate. That, or, dare I say it out loud, a GM 200R4.



My buddy runs a 700R4 behind a BB ford and he even
uses the lock up during racing... he gets like 3 more
mph out of it in lock up... he doesnt use the OD when
racing... thats on a heavy pick up(3900 lbs)
The reason I said the 518 is thats a 727 and the 500
is a 904... with what he is running a straight forward
re-build on the 518 would handle his power... the
500 being a 904 is gonna need some fancy stuff to
take any power... but that shouldnt be any issue and
yes its lite... I went with the 518 for the added
clutch area ...my engine is only 550 hp and 520 tq





light compared to what?an iorn 727?they are heavy and drink power.
if given the choice of a mild 383 with a 518 and a hotish 318 with a 904 i think the gas mileage would be close and (remember 323 gear) and the small block would beat it around a road course.

the right 518 are getting hard to find (no electronics)

id bet your friend has alot of cash in that 700r4.ive had friends shred thos with 305s.