Hey, debating a project right now. I've settled on an LS3/L99 engine, trying to decide on the transmission. I've found a harness maker who says they are working on a harness (don't want to name them until they're done) that will let an LS3 go in front of an 8L90E. But, it seems the 8L90E has a lot of problems with shudder and harsh shifting and so far nobody's been able to solve. Has anyone here come across this problem and used EFI Live to solve it? I really loved the 8 speed my Charger had, which is why I really want one in this project, but not if I can't solve a shudder problem.