Hey everybody, I just came over from IFSJA after meeting MC and Mudrat at the East Coast Invasion, a couple of real decent guys. Too bad I missed out on the brew!

Here's my situation. I'm thinking about a diesel swap into a FSJ. My only (foreseen) problem is the RPMs. Even with 35's, I calculated that I would need gears in the 2.5:1 range. No thanks! So there goes my th400.

My question is, how similar to a 400 is a 4L80? Similar enough to bolt up to the QT adapter? I think probably. Similar enough to swap in the OP shaft for the QT? I doubt it, but would like to know for sure.