I haven't worked on a stacked unit but changed a transmission on a GE compact washer years ago. It's not too hard, I was able to do it without a manual. Make sure you bring enough extensions to get to the agitator nut. The hub nut is the same as the full size washer, uses the same spanner wrench and is left handed thread. I left the outer tub in place but you might not be able to with a stack unit. The 31-9044 GE WSL Washer Manual in the Google Drive folder should help you out.