so, ive been planning a rebuild to put a WR 1st and 2nd gear into my YZ trans. I did the research on here, read a few posts on how it was possible to replace the 1st 2nd and 5th gears with WR gears. so i call my dealer and he talks to the head mechanic who has tried this swap before... SUPRISE! presumably its all or nothing. he said that the dogs would not line up between YZ and WR gears. anyone know what i can do? i have the cases split and dont know what im going to do. maybe a slighty shorter YZ400 1st and 2nd? i want a wider ratio trans. are any gears interchangable? any knowledge is greatly appreciated.