O/D A/T behind a 440??

yes. but you didn't say you wanted cheap.

by the time you buy the new bell housing, a trans, have the trans built, all the crap needed to put a 518 in its not going to be all that cheap either..

don't have to cut anything to get a gear vendors in though. a lot less trouble too in my opinion to hook all up too.. just not as great as OD ratio..