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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.
    Fig 3: Installing Rear Countergear Bearing
    G92G12522Courtesy of GENERAL MOTORS CORP.
  9. Remove countergear support. See Fig 2. Tap countergear front bearing assembly into case. Install countergear front bearing cap and NEW gasket. Slide speedometer drive gear over mainshaft, to bearing.
  10. Install rear bearing retainer with NEW gasket. On 4WD models, install parking brake backing plate and NEW mainshaft lock nut; tighten lock nut using Main Bearing Lock Nut Socket (J-23070). See Figure. On all models, tighten lock nut.
  11. Place transmission gears in Neutral position. Partially engage reverse idler gear with countergear, and move reverse shift fork an equal distance in shift cover.
  12. Install cover and shift fork assembly onto transmission. Reverse shift fork should enter case first. Ensure 1st-2nd and 3rd-4th shift forks engage synchronizer collars. Install cover bolts. Lock transmission in 2 gears at once. Tighten yoke nut. Tighten nuts and bolts to specification. See TORQUE SPECIFICATIONS .
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