Open Differential
| Item Number | Description |
|---|---|
| 1 | Cover |
| 2 | LH (left hand) rear drive halfshaft oil seal |
| 3 | Filler/Level plug |
| 4 | Input flange |
| 5 | Front mounting points with insulators |
| 6 | Carrier |
| 7 | Rear mounting points |
| 8 | Breather |
| 9 | RH (right hand) rear drive halfshaft oil seal |
| 10 | Magnetic drain plug |
The open differential is a conventional design using a hypoid gear layout. The final drive ratio is 3.31:1.
The outer casing comprises two parts; a cover and a carrier. The carrier provides locations for all the internal components. Nine bolts attach the cover to the carrier. The cover and carrier have cast fins, which assist rigidity and cooling. A breather is fitted to the top of the carrier.
Exploded View of Open Differential
| Item Number | Description |
|---|---|
| 1 | Bolt (9 off) |
| 2 | Oil seal |
| 3 | Cover |
| 4 | Shim |
| 5 | Bearing assembly |
| 6 | Bolt (10 off) |
| 7 | Differential case |
| 8 | Bearing assembly |
| 9 | Oil seal |
| 10 | Oil slinger inner |
| 11 | Oil slinger outer |
| 12 | Input flange |
| 13 | Pinion nut |
| 14 | Collapsible spacer |
| 15 | Shim |
| 16 | Bearing assembly |
| 17 | Pinion shaft |
| 18 | LH mounting insulator inner |
| 19 | LH mounting insulator rubber |
| 20 | LH mounting insulator outer |
| 21 | Carrier |
| 22 | RH mounting insulator inner |
| 23 | RH mounting insulator rubber |
| 24 | RH mounting insulator outer |
| 25 | Oil seal |
| 26 | Drain plug |
| 27 | Breather tube |
| 28 | Breather cap |
| 29 | Shim |
| 30 | Bearing assembly |
| 31 | Drive gear |
| 32 | Shaft |
| 33 | Planet gear (2 off) |
| 34 | Thrust washer (2 off) |
| 35 | Sun gear (2 off) |
| 36 | Spacer (2 off) |
| 37 | Roll pin |
| 38 | Fill/Level plug |
The open differential comprises a pinion shaft with a hypoid gear, and a crown wheel drive gear attached to a differential case. The differential case houses two planet gears and two sun gears.
An input flange is installed on the externally splined outer end of the pinion shaft and retained by a pinion nut. The input flange has six threaded holes for the driveshaft attachment bolts. An oil slinger and oil seal are installed in the carrier to seal the input flange. The hypoid gear of the pinion shaft mates with the drive gear.
Ten bolts attach the drive gear to the differential case. The differential case is mounted on taper roller bearings located in machined bores in the carrier and the cover. Shims are installed behind the bearing cups to apply the correct bearing preload and hypoid backlash.
The differential case has a through hole, which provides location for a shaft. Two planet gears are installed on the shaft, with thrust washers between the planet gears and the differential case. A roll pin locks the shaft to the differential case.
Two sun gears are located in pockets in the differential case and mesh with the planet gears. Spacers are fitted between the sun gears and the differential case to give the correct mesh contact between the planet gears and the sun gears. Each sun gear has a machined bore with internal splines and a machined groove. The splines transfer drive to the rear drive halfshafts. The groove provides positive location for the snap ring fitted to the inboard end of the rear drive halfshafts.
Oil seals are installed in the carrier and the cover to seal the rear drive halfshafts.
The open differential contains a quantity of oil for splash lubrication of the internal components. A magnetic drain plug is installed in the bottom of the carrier and a filler/level plug is installed in the cover.