I have a TH-400 I am getting ready for the drive shaft. The problem I have is the output shaft seal is 1.6 and no one makes a yoke with 1350 u-joints nor do I really want it.(just a yoke with a thinner wall) Are the output shafts the same in the newer Th-400 as the old ones? What i would like to do is just switch the tailhousing out so I have a different seal size on the back of the Tranny. The seal size I need is 1.88 or can I take the tailhousing that I have and machine it out?