The differential gear contained in the differential casing is not normally a diy repair job. This is because failure is extremely rare and in circumstances of extreme wear as a result of either neglect or high mileages the whole assembly would need to be renewed anyway.

The function of the differential is to enable the driven wheels of the vehicle to rotate at different speeds when the car is turning and the outer wheel is obliged to travel in a wider arc than the inner wheel. Each drive shaft has a bevel gear at the inner end and these are meshed constantly together with two bevel pinions. The shaft on which both pinions are mounted is fixed into the differential casing.

The crownwheel, which takes the drive from the gearbox, is bolted to the differential casing. When the drive rotates the differential casing, the pinion shaft is carried round with it and the pinion gears therefore rotate the drive shaft gears.

1968 – 1979 VW 1600 Transporter Differential Assembly

1968 - 1979 VW 1600 Transporter Differential Assembly

1. Taper roller side bearing
2. Crown wheel (ring gear)
3. Differential housing
4. Shaft retaining pin
5. Thrust washer
6. Differential gear and drive shaft
7. Spacer sleeve
8. Differential pinion
9. Thrust washer
10. Pinion shaft
11. Differential gear and drive shaft, short
12. Housing end cover
13. Bolt with spring washer

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