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"
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.
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".