Overdrive tranny in an A-body

Are you kidding? The front of a 518 is all 727; easily modified to go well over 1,000 hp. Cheap too. And the overdrive is twice what that Gm box has.

I can't seem to find a 518 rated for 1000+ hp for sale anywhere. They seem to max out at just over 500hp because the overdrive unit on the back of the 518 is the weak link (part of the reason it's less efficient, heavier and takes more power to spin than a 2004R), but please post a link showing 1000+ hp rated 518's for sale.