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HOMESERVICE MANUALSGMC1992VALUE VAN 4.3 Z, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSREMOVAL & INSTALLATION - A/TTRANSFER CASE (A/T)NP-231 & NP-233REMOVAL
1992 GMC Value Van 4.3 Z, Automatic

NP-231 & NP-233: Removal

1992 GMC Value Van 4.3 Z, AutomaticSECTION Removal
  1. Disconnect negative battery cable. Move transfer case shift lever to 4H position. Raise vehicle and remove skid plate. Drain transfer case. Mark front and rear output shaft yokes and drive shafts for reassembly reference and remove shafts.
  2. Disconnect speedometer cable and vacuum harness from transfer case. Disconnect shift linkage from case. Remove catalytic converter hanger bolts at converter and loosen front catalytic converter clamp.
  3. Raise transmission and transfer case assembly with jack and remove transmission mount bolts. Remove catalytic converter front bracket. Lower transmission and transfer case. Support transfer case alone and remove transmission-to-transfer case bolts.
  4. Remove shift lever bracket from transfer case adapter in order to reach upper left attaching bolt. Separate transfer case from transmission adapter and remove from vehicle.
RENDER: 1.0x

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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.