Differences in 904 sun shells

I can see why you need a bigger washer inside the shell with the low gear set. The pinion carrier is larger in diameter and so is its four tab thrust washer. If you don’t use the big washer that comes with the low gear shell, the small washer doesn’t cover the entire surface of the 4 tab thrust washer. It only covers about 1/2 of it. Yeah, I have it assembled temporarily. The gear train end play is .030. Haven’t put the pump in it, but will to check overall end play. I’m going to check it and pull it out and take a bunch of pictures in case someone else runs into it.