There are a multitude of different diffs available for your Land Rover - read about the different types of locking diffs

Shaft Description - Rover type
Shaft Diameter - 28.2 (1.11")
Splines - 10
Ratio - 4.7

Air Locker locking differentials allow you to tackle the toughest terrain.
Ultra durable and extremely strong - only the highest quality materials used in construction. Air Locker locking differentials allow you to tackle the toughest terrain. As the world's premier traction aid, ARB Air Lockers keep you moving in all conditions.

Notes
1 If vehicle was manufactured during 1993, check spline count.
2 Air Locker not available for vehicles equipped with high load option.
3 Ring gear spacer required. Longer ring gear bolts (not supplied) are also necessary - (Land Rover part no. 576521).
4 When an DA4191 Air Locker is to be installed in Range Rovers manufactured prior to 1980 (approx.), special carrier bearings (No. K11300/K11162) may also be necessary - Land Rover part no. RTC3426.
5 Some vehicles have crown wheel bolts which cannot be reused and must be replaced. Consult service manual.
6 P38A is most commonly found in traction control equipped vehicles. Identify P38A type diff by large 205mm [8.07"] flange diameter. P38A was not used on North American delivered Discoverys - use DA4193.

Front / Rear

Series 1 / 2 / 2A / 3 - 1948 - 1985 (front/rear) 2,3

Defender 90 - 1984 - 1993 (front) 1

Defender 90 - 1983 - 1993 (rear) 1,2

Defender 110 / 130 - 1983 - 1993 (front) 1

Discovery 1 - up to 1993 (front & rear) 1

Range Rover Classic - up to 1992 (front/rear) 1,4

ARB Diff Locker – Series 1 / 2 / 2A / 3 1948–1985 (front/rear) 2,3 (+5 more)