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 1987 - 1994 (xj40) Classic FUEL FILTER BRACKET MOUNT NEW
JAGUAR XJS XJ12 XJ40 X300 AJ6 AJ16 V12 5.3 6.0 GENUINE ENGINE MAIN OIL FILTER
Jaguar XJ6/X300/XJ40 CRUISE CONTROL PUMP
BLACK 8MM PERFORMANCE HT LEADS FITS JAGUAR XJ6 X300 XJ40 XJS XJSC 3.2 3.6 4.0
RED 8MM PERFORMANCE HT LEADS FITS JAGUAR XJ6 X300 XJ40 81 XJS XJSC 3.2 3.6 4.0
