Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET1987S10/T10 P/U 2WD L4-151 2.5LREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSDIFFERENTIAL PINION SHAFT LOCK SCREW - SERVICE
1987 Chevrolet S10/T10 P/U 2WD L4-151 2.5L
Differential Pinion Shaft Lock Screw - Service
1987 Chevrolet S10/T10 P/U 2WD L4-151 2.5LSECTION Differential Pinion Shaft Lock Screw - Service
Number: 93-77-4B
Section: 4B
Date: JAN. 1993
Corporate Bulletin No.: 264207
ASE No.: A3
Subject: DIFFERENTIAL PINION SHAFT LOCKING SCREW
Model and Year: 1984-93 CAPRICE AND CAMARO 1984-93 ALL 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 (GM Part number 12345382), or equivalent, 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 Threadlooker 12345382
Parts are currently available from GMSPO.
Section: 4B
Date: JAN. 1993
Corporate Bulletin No.: 264207
ASE No.: A3
Subject: DIFFERENTIAL PINION SHAFT LOCKING SCREW
Model and Year: 1984-93 CAPRICE AND CAMARO 1984-93 ALL 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 (GM Part number 12345382), or equivalent, 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 Threadlooker 12345382
Parts are currently available from GMSPO.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.