I recently upgraded my rear end to 4.10's and once i put the driveshaft back in i noticed a bad vibration/sound at high speeds coming from the back of the tranny... After a week I realized the seal in the rear of the tranny was blown... i replaced it and 3 days later it was blown again ... my question is why does the seal keep going and what is causing that vibration... what could i do to fix these problems
thanks in advance
Dave

 

An out of balance drive shaft can make the bushing in the tailshaft sloppy which in turn will eat up seals.