Rear Differential: Functions and Components
The cast iron casing comprises two parts; a cover and a carrier. The carrier provides locations for all the internal
components. The carrier is sealed to the cover via an O-ring seal and secured with twelve bolts. The cover and carrier
have cast fins, which assist mobility. A breather tube is fitted to the top of the carrier. This allows a plastic tube to be fitted
and routed to a high point under the vehicle body, preventing the ingress of water when the vehicle is wading.
The carrier contains an oil drain plug. The differential unit contains approximately 1.16 litres of oil from a dry fill. If oil is
being replaced, a smaller quantity of oil will be required due to residual oil retained in the pinion housing.
The differential is a conventional design using a hypoid gear layout, similar to the front differential. The open rear
differential is available in three ratios. V8 petrol engine vehicles use a differential with a final drive ratio of 3.73:1, V6
petrol engine vehicles use a differential with a final drive ratio of 3.73:1 and TdV6 engine vehicles use a final drive ratio of
3.54, for vehicles with automatic transmission and 3.07 for vehicles with manual transmission. Changing the number of
teeth between the crown wheel drive gear and pinion gear changes the ratio.
4
-
Bearing pre-load spacer
5
-
Bearing
6
-
Roller bearing cup
7
-
Cover
8
-
Seal
9
-
Differential carrier
10
-
Gear and pinion assembly
11
-
Bearing
12
-
Roller bearing cup
13
-
Shim
14
-
Collapsible spacer
15
-
Pinion nut
16
-
Retainer
17
-
Flange
18
-
Outer deflector
19
-
Inner deflector
20
-
Oil seal
21
-
Bearing
22
-
Roller bearing cup
23
-
Roll pin
24
-
Breather cap
25
-
Breather
26
-
Case
27
-
Data location
28
-
Mounting bush
29
-
Bearing
30
-
Bearing pre-load spacer
31
-
Roller bearing cup
32
-
Plug
33
-
Drain plug
34
-
Thrust washer
35
-
Planet gears
36
-
Crosspin shaft
37
-
Sunwheel
38
-
Thrust washer
39
-
Bolt, 10 of
40
Bolt, 12 of
