Well crap. I think it was just the HD diff that was the difference. If that's the case, I'm stuck with the trans I have now then. I can replace the solenoids, but should I replace all of them? What else should I do while I'm in there? I have a few hundred to throw at it, but I can't go overboard with it. IF I could find someway to make the GT trans work, I could get the trans, subframe, and oil pan for $188+tax...