Except I don't think anyone has run a 5r in a single cab drag truck, so that is really hard to say. It may not act as funky at high power in a drag truck with the lighter weight.... just thinking out loud. But doesn't the shift sequence in the 4r have less parts to move? I'm not all that familiar with them
There has been quite a few people run 5Rs in single cabs. I only know of a couple that have had success.
Seeing the success Craig is having, and many other people are having, with the 47, that would be a sweet option, if you could swing it.. That seems like an expensive set up though. I don't see why a 4R wouldn't suite your needs Drake.. Plenty of people having success with them in their 9sec drag trucks. H&S was going 9.20s, iirc, in their triple turbo 6.7 in the 4wd dodge single cab, with a 4R. I don't know how many runs they were getting out of it though.