Also, if your diff has been changed in the past (possibly with a late XJ40 or X300 diff) then it is worth checking. There are two differences on the output shaft seal.This seal is to fit the EARLY cars.
JAGUAR XJ6 XJ12 XJ40 DIFFERENTIAL OUTPUT SHAFT REBUILD KIT BEARINGS SEALS TIMKEN
JAGUAR XJ6 XJ12 XJS XJ40 (1979-96) FUEL TANK LOCK RING & SEAL for SENDER UNIT
Heater Valve fits Jaguar XJS 1976-1996, Jaguar XJ6 XJ12 Series 2 & 3 , CCC4915
Jaguar XJ6/X300/XJ40 CRUISE CONTROL PUMP
JAGUAR XJ6 XJ12 X300 DIFFERENTIAL OUTPUT SHAFT REBUILD KIT BEARINGS SEALS KOYO
British Parts Jaguar XJ6 XJ12 XJS Cruise Control Bellows Speed Control AEU4090
