I am building a '77 CJ 5 with a 304 V8, minor motor mods, the tranny I have is a T-150 with a dana 20 t case. What is a stronger tranny and t case, or is the dana 20 ok? Where can I find a tranny, it seems like the T-18 and the more popular other trannys are very hard to come by. Any help is greatly appreciated!!