Center Differential
| ITEM | DESCRIPTION |
|---|---|
| 1 | Drum clutch |
| 2 | Plate clutch pack |
| 3 | Synchronization cup |
| 4 | Synchronization spring |
| 5 | Differential carrier |
| 6 | Planetary pinion gear shaft (3 off) |
| 7 | Planetary pinion gear (3 off) |
| 8 | Pinion gear shaft (3 off) |
| 9 | Pinion gear (3 off) |
| 10 | Shifting sleeve |
| 11 | Multiplate clutch basket |
| 12 | Bolts (6 off) |
| 13 | Synchronizer sleeve |
| 14 | Planetary sun gear |
| 15 | Differential side gear (2 off) |
The center differential assembly is the primary feature of the twin speed transfer case. Torque is transmitted through the center differential carrier and distributed to the differential gears and the front and rear output flanges. The planetary gear set, for the high/low range change function, is also an integral part of the center differential assembly.
The assembly comprises three differential pinion gears and shafts, which are equally spaced within the center differential carrier. The differential shafts have a rigid connection to the differential carrier. Three planetary pinion gears and shafts are located between the pinion gears. The planetary sun gear and two differential side gears are located in the centerline of the differential carrier.
The planetary ring gear is supported in both directions by the differential casing and the differential cover. The planetary ring gear is connected to a shifting sleeve, which is engaged in either high or low range.
The multiplate clutch basket, which is welded to the differential casing, supports the friction plates. The dogteeth, synchronization cup and synchronization spring supports high range engagement for the range change function.
| ITEM | DESCRIPTION |
|---|---|
| A | High range position |
| B | Low range position |
| 1 | Dogteeth |
| 2 | Planetary pinion gears |
| 3 | Planetary ring gear |
| 4 | Shifting sleeve |
| 5 | Low range dogteeth |
| 6 | Rear carrier assembly |
When high range is engaged, the shifting sleeve connects to the differential carrier via dogteeth. The planetary ring gear, via the shifting sleeve, and the planetary pinion gears, via the planetary shafts are also attached to the differential carrier. The planetary gear set rotates as one unit and therefore turns the differential side gear with a 1:1 ratio.
In low range, the motor moves the shifting sleeve in the direction of the low range dogteeth. The low range dogteeth is fixed to the rear carrier assembly. When the shifting sleeve is engaged with the low range dogteeth, the planetary ring gear, via the shifting sleeve, is stationary and the planetary pinion gears, via the planetary bolts, turn the differential side gears with 2.93: 1 ratio.