904 vs 727

superdart said
904 is all you need. Parts are readily available..There are a couple guys in our club running them in thier drag cars and they have no reliability problems.

I would have kept mine, but stumbled on a cheap 518....and I really wanted overdrive.

is the 518 an overdrive automatic tranny? Is that better on gas? How hard was it to put that in?

BTW...Im reading there is also a A-500

A-510 being a 727 with OD and a A-500 a 904 with OD

Can a 904 be rebuilt with an overdrive gear in it?