DIFFERENTIAL PINION SHAFT LOCKING SCREW (INFORMATIONAL)

SUBJECT: DIFFERENTIAL PINION SHAFT LOCKING SCREW

MODELS: 1993 AND AND PRIOR MODEL YEAR LIGHT DUTY TRUCKS

Anytime a differential pinion shaft locking screw is removed (Figure 1), it is important to coat the screw threads with Loctite 242 before reinstalling. These screws are coated with an adhesive which helps to prevent the screw from loosening in the case. When this screw is removed, the adhesive is also removed. If a new locking screw is necessary, they are available through GMSPO and are coated with the correct adhesive.

Torque the locking screw to the following specifications:

7-1/2", 7-5/8" and 8-1/2" 36 N-m (27 lbs. ft.)

9-1/2" 50 N-m (37 lbs. ft.)

PARTS INFORMATION

If a new differential pinion shaft locking screw is required, order the following:

Application Part Number ----------- ----------- 7-1/2", 7-5/8" and 8 1/2" 14056196

9-1/2" 12337979

Goodwrench 242 Threadlocker 12345382

Parts are currently available from GMSPO.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.