This rebuilt differential for Morris Minors, Sprites and Midgets has a 4.55:1 ratio, which is good for racing applications as it keeps the engine in a good power band for quick acceleration. It produces higher engine revs at speed and provides 14.1 mph per each 1000 rpms in top gear. This differential is built in a Morris Minor housing with the fill plug on the side or in a Spridget type housing with a fill plug that's been added.

This differential has a new 4.55 ring and pinion gear set or a good used one.

These differentials are rebuilt with all new bearings, cross pins, thrusts, spacers, and seals. Other parts like the planet and sun gears may be replaced at extra cost if required.