Component Tests

Traction-Lok Differential

A Traction-Lok differential can be checked for proper operation without removing it from the rear axle housing (4010) .

 WARNING: NEVER RUN ENGINE WITH ONE WHEEL OFF THE GROUND. A VEHICLE EQUIPPED WITH A TRACTION-LOK DIFFERENTIAL WILL ALWAYS HAVE BOTH WHEELS DRIVING. IF, WHILE THE VEHICLE IS BEING SERVICED, ONLY ONE WHEEL IS RAISED OFF THE FLOOR AND THE REAR AXLE IS DRIVEN BY THE ENGINE, THE WHEEL ON THE FLOOR COULD DRIVE THE VEHICLE OFF THE STAND OR JACK. BE SURE BOTH REAR WHEELS ARE OFF THE FLOOR.

Raise up one rear wheel and remove the wheelcover. Install adapter for Traction-Lok Differential T59L-4204-A or Torque Tool T66L-4204-A on the axle shaft flange studs.

Using a torque wrench of at least 271 Nm (200 lb-ft) capacity, rotate the axle shaft (4234) . Be sure that the transmission is in NEUTRAL, one rear wheel is on the floor, and the other rear wheel is raised off the floor. The breakaway torque required to start rotation should be at least 27 Nm (20 lb-ft). The initial breakaway torque may be higher than the continuous turning torque, but this is normal. The axle shaft should turn with even pressure throughout the check without slipping or binding. If the torque reading is less than specified, check the differential for improper assembly.

Companion Flange Runout Check, Rear Axle

1. Raise the vehicle on a hoist that supports the rear axle (twin post hoist). Refer to Section 00-02.

2. Remove the driveshaft (4602) assembly. Refer to Section 05-01.

3. Check the circular rear axle universal joint flange (4851) for damage.

4. Position Companion Flange Runout Gauge T92L-4851-B on companion flange pilot.
   
   
   
   
   

   Item	Part Number	Description
   1	—	Pilot (Part of 4851)
   2	—	Pinion Nut
   3	T92L-4851-B	Companion Flange Runout Gauge
   4	—	Bolts (2 Req'd)
   5	T92L-4851-C	Clamp Plate
   6	4851	Rear Axle Universal Joint Flange

5. Install Clamp Plate T92L-4851-C on runout gauge.
   
   
   
   

6. Align holes in clamp plate with holes in rear axle universal joint flange and install bolts. Snug bolts evenly.
   
   
   
   

   NOTE: Refer to Section 05-02A (7.5 inch) or Section 05-02B (8.8-inch) for rear axle universal joint flange Removal and Installation procedures.

    CAUTION: This operation disturbs the pinion bearing preload. Pinion bearing preload must be reset if the pinion nut has been loosened or removed for companion flange re-indexing or replacement.

7. Turn companion flange runout gauge as shown to locate and mark high spot on rear axle universal joint flange. If flange runout exceeds 0.010 inch, remove rear axle universal joint flange , re-index 180 degrees on pinion and re-install. Check runout again. If necessary, rotate rear axle universal joint flange on pinion shaft until an acceptable runout is obtained. If flange runout is still more than 0.010 inch, replace rear axle universal joint flange .
   
   
   
   

8. If excessive runout is still evident after replacement of the rear axle universal joint flange , it will be necessary to replace the differential ring gear and pinion (4209) , and repeat the above checks until runout is within specifications. Install the driveshaft assembly as outlined in Section 05-01. Tighten bolts to 95-130 Nm (70-95 lb-ft).