Take a close look at the shaft going into the SEAL....Is there a groove worn into it from the previous seal ???? If so, thats a problem.
If not, then check the bushing(s) around the tail shaft (behind the seal), if the shaft wobbles around in the bushings then replace the bushings (or Bearings)....
Good luck..... "BH"
07-JKU-X /Poison spider Evap.Skid/Master craft grab handles/Or-Fab spare tire-can carrier/ Gibson SS Duals/ Q-tec Floor Liners/Hidden Hitch Receiver/ AntennaX 7inch/ 48" Hi-Lift./ 8"X16"X4"bs Steel smoothie wheels/ 265X75R-16,Kelly Safari TSR tarz.
Viet Nam Veteran 69-70, Troop "D" (AIR) 3/4 Cav. ,25th Inf. Div. CUCHI RVN. UH-1H Crew Chief of the "Pinball Wizard" 68-16224. Call Sign "CENTAUR".