Differential Case and Ring Gear - Model 70, Limited Slip

Differential Case and Ring Gear - Model 70, Limited Slip







Limited-Slip Differential - Model 70 Trac-Lok









Disassembly

1. Remove the differential case. For additional information, refer to Differential Carrier - Dana 70 Differential Carrier - Dana 70.

2. Index-mark the differential case.

1. Index-mark the differential case flange (ring gear) and button (cover) halves.

2. Index-mark the differential pinion shafts and corresponding ramps.





3. NOTE: It is not necessary to remove the differential bearings to overhaul the limited-slip differential.

NOTE: In most cases it is possible to disassemble the unit without removing the differential ring gear, which saves the cost of new bolts.

Remove the ring gear if required. For additional information, refer to Differential Ring And Pinion - Dana 70 Differential Ring And Pinion - Dana 70.

4. NOTE: An axle shaft held in a vise, with the shaft splines extending not more than 76.2 mm (3 in) above the vise jaws, makes an excellent holding fixture for the differential case.

Loosen, but do not remove, the 8 bolts.





5. Place the differential assembly on a bench.

6. Remove the 8 bolts and the button half of the differential case.





7. Remove the differential side gear, rear axle disc and plate kit, 4 differential pinion gears and the 2 differential pinion shafts. Keep these parts in order for correct installation by placing them aside with the button half of the differential case.

8. Remove the rear axle disc and plate kit from the flange half of the differential case. Keep these parts in order.

9. Inspect the following components:
- The clutch plates and clutch discs for cracks, excessive wear and distortion. Always install an entirely new rear axle disc and plate kit on both sides if discarding one or more of the clutch plates or clutch discs.

- The differential pinion shafts for excessive wear or pitting.

- The differential side gear and differential pinion gear teeth.

Assembly

1. Coat the rear axle disc and plate kit with rear axle lubricant.

2. NOTICE: After assembly, make sure that the side gear splines engage the clutch pack splines and the differential side gear is fully seated or damage to the component may occur.

Install the rear axle disc and plate kit and the side gear in the flange half of the differential case.









3. NOTE: For vehicles operating at close to their Gross Vehicle Weight Rating (GVWR), typically emergency vehicles and vehicles equipped with a fifth wheel, there may be circumstances of continuing chatter/bumping in turns despite the installation of new parts and lubricant. In cases such as this, it is permissible to reassemble the rear axle disc and plate kit with the clutch disc adjacent to the differential side gear, resulting in 2 clutch plates together. This results in 3 friction surfaces instead of the normal 5, lowering the torque to rotate the wheel by 40%.

Align the clutch pressure plate lugs, and install the side gear, the clutch pack and differential side gear in the button half of the differential case.

4. NOTICE: Align the index marks made during disassembly or damage to the component may occur.

Place the differential pinion shaft and 2 differential pinion gears in the button half of the differential case.





5. NOTICE: Align the index marks made during disassembly or damage to the component may occur.

Install the other differential pinion shaft and 2 differential pinion gears in the flange half of the differential case.





6. NOTICE: Align the index marks made during disassembly or damage to the component may occur.

Assemble the differential case.

- Place the button half of the differential case onto the flange half of the differential case assembly.

- NOTICE: The bolts must be clean and dry or damage to the component may occur.

Install the 8 bolts. Turn each one in a few threads.

- Tighten the bolts evenly and alternately.
- Tighten to 129 Nm (95 lb-ft).





7. Install the ring gear if removed. For additional information, refer to Differential Ring And Pinion - Dana 70 Differential Ring And Pinion - Dana 70.

8. Install the differential case. For additional information, refer to Differential Carrier - Dana 70 Differential Carrier - Dana 70.