I used a case from a lock up 904 for a non lock up before. The difference in lock up vs non in either is the front input shaft has an oiling hole in it, the front guts, front pump I think, and valve body.

I cant tell ya for sure which parts are different, but its internals basically.

The 904 I changed out is still alive, and I dont recall changing or blocking any fluid passages.

Kasey