Does the output yoke on your SYE move at all?
Ive been chasing a horrible vibration problem. It happens above 40, is speed, not gear or engine speed related, gets more intense under acceleration, and the worst on deceleration, esp. after heavy acceleration.
Eventually found out that my driveshaft splines were completely frozen. I had to use a pry bar to get the flange off of the pinion to remove the "old" shaft. Anyway, I had just lived with this vibration for a while. While I was putting my shiny new tom woods on, I noticed the rear output yoke on my np231 was able to move about 1/8th inch forward and back, but the nut was tight. The entire output shaft was moving. I dont remember that being the case when I put the SYE in. Does anyone know if thats a normal thing on their SYE?
Oh if it helps, I noticed it first after an axle, motor and transmission swap. I blew up my 35 and broke U joints in one "rear end anit-gravity event". Decided to go all out. The 8.8 was "new" from ecgs, and the 4l60e new from novak, so im sort of guessing that they arent the problem. The pinion is aimed properly, Driveshaft is a double cardan to accompany the lift...I cant think of anything else it could be. Yall think I need to tear apart the 231?