phrog blog

Model		Year	Gear ratio		Width
E Type		61-75	3.07,3.31,3.54		* 52"
Mk 10		61-75	3.54,3.77		* 60.5"
S Type		63-68	3.54,3.77		* 55"
420		66-68	3.54			  55"
420G		66-70	3.54,3.77		* 60.5"
XJ6 4.2l	68-85	3.31,3.54,3.77		  61"
XJ6 2.8		68-85	4.09,4.55		  61"
XJ12		72-85	3.31			* 61"
XJ6/12 S3       79-92   2.88,3.07                 61"
XJS		75-96	2.88,3.07,3.54		* 61"

* = Factory Posi

XJ6 – 69-73 (Series I)
Girling Callipers/1/2″ Rotors
Ball Bearing Stub Axles
3.54 Gears
61 3/4″ wide

XJ6 – 73-79 (Series II)
Girling Callipers and 1/2″ Rotors but with Odd dust Cover
Tapered roller bearings on Stub axles standard 3.31 gears with locker optional
61 3/4″ wide

XJ6 – 79-88 (Series III)
Girling Callipers 1/2″ Rotors
Tapered roller bearings on stub axles with Drain hole in Stub axle flange
2.88 Gears Locker optional
61 3/4″ wide

XJ6/XJ40 – 88-95
Completely different set up, not recommended for aftermarket applications

XJS – 76-87
Girling Callipers 1/2″ Rotors
All Powerlock Gears
Tapered Roller Bearings on Stub axles
3.31 Gears
61 3/4″ wide

XJS – 87-89
Girling Callipers 1/2″ Rotors
Flat bottom diff with NO drain plug and 3 bolt mounted stub axles
American Dana Unit with weak traction lock (Not recommended)
2.88 Gears
61 3/4″ wide

XJS – 89-95
Girling Callipers 1/2″ Rotors
ABS on uprights/speedo pickup in rear aluminum diff cover
2.88 Gears
61 3/4″ wide