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HOMESERVICE MANUALSGMC1986SUBURBAN C2500, 5.7 M, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONMANUAL TRANSOVERHAUL - GM 117 4-SPEEDTRANSMISSION REASSEMBLY
1986 GMC Suburban C2500, 5.7 M, Standard

Transmission Reassembly

1986 GMC Suburban C2500, 5.7 M, StandardSECTION Transmission Reassembly
NOTE: Use thread sealant on all bolt threads. Lubricate all parts with transmission gear oil as they are being installed.
  1. Lower countergear into case until it rests on bottom of case. Place reverse idler gear in transmission case, with gear teeth toward front.
  2. Install reverse idler gear shaft into case from rear. Ensure slot in end of shaft faces down. Shaft slot face must be at least flush with case.
  3. Install mainshaft assembly into case, with rear of shaft protruding out rear bearing hole in case. Position Bearing Installer (J-22874-5) in countershaft case opening, and engage front of mainshaft. See Fig 1. Rotate case onto front end.
    Fig 1: Installing Mainshaft Rear Bearing
    G92E12520Courtesy of GENERAL MOTORS CORP.
  4. Install 1st gear thrust washer on shaft, if not previously installed. Install retaining ring on bearing outside diameter, and position rear mainshaft bearing on shaft.
  5. Using Bearing Installer (J-22874-1), install bearing until retaining ring is flush with case. See Fig 1. Rotate case, and remove tool. Install 4th gear synchronizer ring. Ensure 3 cut-out sections align with synchronizer keys.
  6. Ensure main drive gear pilot roller bearings are in place. Install main drive gear with cutout facing down. Tap on outer bearing race to install assembly.
  7. Install drive gear bearing retainer and NEW gasket. Install Countergear Support (J-22874-10) into countergear front bearing opening in case. See Fig 2. Rotate case onto front end.
  8. Install NEW retaining ring on countergear rear bearing. Position bearing on countergear, and use Bearing Installer (J-22874-1) to seat bearing. See Fig 3. Ensure retaining ring is flush with case. Rotate case, and install NEW retaining ring on countershaft at rear bearing.
    Fig 2: Supporting Front of Countergear
    G92F12521Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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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.