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HOMESERVICE MANUALSGMC1993JIMMY BASE, 2D UTILITY, 4.3 Z, RWD, STANDARDREPAIR AND DIAGNOSISDRIVELINES & AXLESDIFFERENTIALS & DRIVE AXLESDRIVE AXLE - FRONTOVERHAULFRONT AXLE ASSEMBLYREASSEMBLY
1993 GMC Jimmy Base, 2D Utility, 4.3 Z, RWD, Standard

Front Axle Assembly: Reassembly

1993 GMC Jimmy Base, 2D Utility, 4.3 Z, RWD, StandardSECTION Reassembly
  1. Install pinion bearing races using Holding Fixture (J-33837-1 ) and Bearing Race Installer (J-33837-4 ) until races are seated in carrier. See Fig 1. Lubricate inner and outer bearings, then set pinion depth. See DRIVE PINION DEPTH  under ADJUSTMENTS.
    Fig 1: Installing Inner Pinion Bearing Race
    G121076Courtesy of GENERAL MOTORS CORP.
  2. Install appropriately sized shim onto pinion. Shim size was previously determined during pinion depth adjustment. Using Pinion Bearing Installer (J-33785) , install inner pinion bearing onto pinion. Install NEW collapsible spacer onto pinion shaft. Lubricate outer pinion bearing and install bearing and pinion seal into carrier case using Seal Installer (J-33782 ). Insert pinion, with attached inner bearing and collapsible spacer, into carrier case.
  3. Install deflector and pinion flange. Apply GM PST sealant to area where pinion threads meet pinion flange. Install pinion washer and nut. Install same flange holder previously used to remove pinion flange. Hold flange while slowly tightening nut and checking pinion flange until no end play is present. DO NOT  tighten nut any further.
  4. Rotate pinion several times to ensure bearings have been seated. Recheck end play. Set final pinion preload to 15-25 INCH lbs. (1.7-2.8 N.m) by tightening pinion nut in small increments, rotating pinion between increments. Each increment increases preload by several INCH lbs.
  5. If preload specification is exceeded, remove pinion and install new collapsible spacer. Once preload has been obtained, rotate pinion several times to ensure bearings have seated and recheck preload.
  6. Install side gears and thrust washers into differential case. If old side gears are being reinstalled, ensure they are placed in their original locations as marked during disassembly.
  7. Position one pinion gear between side gears and rotate gears until pinion gear is directly opposite opening in case. Place remaining pinion gear between side gears. Ensure holes in both pinion gears line up. Rotate pinion gears toward opening just enough to allow installation of thrust washers.
  8. Install differential pinion gear shaft. Install pinion gear shaft bolt. Install ring gear onto differential assembly. Tighten NEW bolts alternately in progressive steps to 60 ft. lbs. (81 N.m). Ring gear uses left-hand thread bolts.
  9. Press side bearings onto differential assembly using Side Bearing Installer (J-33790 ). Press bearings onto sleeves using Bearing Installer (J-33788 ).
  10. Using same side bearing adjusting wrench used during disassembly, install sleeves into carrier case. Install side bearing races into carrier using Race Installer (J-23423-A ). Place differential assembly into left carrier case half. Turn left sleeve inward until backlash is felt between ring and pinion.
  11. Remove carrier case from holding fixture, and attach carrier halves together using 4 bolts. If halves DO NOT  make complete contact, back out right sleeve. Install carrier case bolts and tighten to 35 ft. lbs. (47 N.m). Set ring gear backlash adjustment to specification. See RING GEAR BACKLASH  under ADJUSTMENTS.
  12. Install both side bearing adjusting sleeve lock tabs over left and right sleeves. Remove 4 bolts holding axle carrier halves together and separate carrier halves. Apply Sealant (GM 1052942 or Loctite 518) to one carrier housing surface.
  13. Reconnect axle carrier housing halves. Install 10 attaching bolts and tighten to specification. See TORQUE SPECIFICATIONS  table. Install/drive seal into left side cover. Apply Sealant (GM 1052942 or Loctite 518 ) to left side cover. Install 6 cover-to-carrier bolts securing left side cover and tighten to specification. See TORQUE SPECIFICATIONS  table.
  14. Install deflector onto left output shaft and insert shaft into left side of carrier. Drive shaft into place with a soft-faced (brass or plastic) hammer. Install NEW pilot bearing into right output shaft using Pilot Bearing Installer (J-33842 ). Install washer onto right output shaft, and insert right output shaft into right side of carrier.
  15. Install right axle tube and inner axle shaft assembly. See RIGHT AXLE TUBE & INNER AXLE SHAFT  under REMOVAL & INSTALLATION. To complete reassembly, reverse disassembly procedure.
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.