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)TRANSMISSIONMANUAL TRANSOVERHAUL - NV3500/5LM60 5-SPEED (2-SHAFT)COMPONENT DISASSEMBLY & REASSEMBLYMAINSHAFTDISASSEMBLY
1993 GMC Jimmy Base, 2D Utility, 4.3 Z, RWD, Standard
Component Disassembly & Reassembly: MAINSHAFT: Disassembly
1993 GMC Jimmy Base, 2D Utility, 4.3 Z, RWD, StandardSECTION Disassembly
- Using Gear and Bearing Separator Plate (J-36513) and hydraulic press, remove snap ring, 3rd-4th synchronizer assembly, synchronizer rings and 3rd gear from mainshaft. See Figure
. Scribe marks on hub and sleeve for installation reference.NOTE: Leave synchronizer rings on all synchronizer assemblies to prevent synchronizer detent balls from popping out.
- Remove 3rd gear bearing, retainer ring and 2-piece thrust washer. Remove 2nd gear and 2nd gear bearing assembly using Gear and Bearing Separator Plate (J-36513) and hydraulic press. Remove 1st gear and 1st-2nd synchronizer assembly using Gear and Bearing Separator Plate (J-36513) and hydraulic press.
- Scribe marks on hub and sleeve for installation reference. Remove 1st gear bearing assembly, 5th gear and 5th gear bearing assembly. Remove snap ring. See Figure .
- Remove reverse gear and 5th-reverse synchronizer assembly using Gear and Bearing Separator Plate (J-36513) and hydraulic press. Scribe marks on hub and sleeve for installation reference. Remove 3rd gear bearing assembly.
- Place 1st-2nd, 3rd-4th and 5th-reverse gear synchronizers in separate shop towels. Wrap assemblies and press against inner hub. Disassemble synchronizer assemblies. DO NOT mix parts.
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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.