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.
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HOMESERVICE MANUALSGMC1993JIMMY BASE, 2D UTILITY, 4.3 Z, RWD, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)DRIVELINES & AXLESDIFFERENTIALS & DRIVE AXLESDRIVE AXLE - FRONTADJUSTMENTSDRIVE PINION DEPTH
1993 GMC Jimmy Base, 2D Utility, 4.3 Z, RWD, Standard
Drive Pinion Depth
1993 GMC Jimmy Base, 2D Utility, 4.3 Z, RWD, StandardSECTION Drive Pinion Depth
- Lubricate inner and outer pinion bearings liberally with gear oil. Hold pinion bearings in position and install Pinion Shim Setting Gauge (J-33838 ). Install Dial Indicator (J-29763 ) onto gauge. See Fig 1.
- With gauge installed, preload inner and outer pinion bearings to 10-15 INCH lbs. (1.0-1.6 N.m) by tightening shim setting gauge mounting bolt while holding end of gauge shaft with a wrench. Rotate shaft several times to ensure bearings have seated. Recheck preload.
- Push dial indicator downward until needle rotates about 3/4 turn clockwise. Tighten dial indicator in this position. Set button of pinion shim setting gauge on differential bearing bore. See Fig 1.NOTE: 4WD front axle drive pinion gears are nominal or zero and are not marked on pinion head surface. Shim thickness will equal dial indicator gauge reading.
- Rotate gauge slowly back and forth until dial indicator reads lowest point of bore. Set dial indicator to zero. Repeat rocking action of gauge to verify zero setting.
- After satisfactory zero setting is obtained and verified, move gauge button out of differential side bearing bore. Record dial indicator reading. Use a shim that is exactly the same size as this indicator reading.
- Remove dial indicator and gauge from carrier. Position correct shim on drive pinion. Install drive pinion bearing. Continue at step 2) of REASSEMBLY under FRONT AXLE ASSEMBLY under OVERHAUL.
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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.