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 MANUALSGMC1992MAGNAVAN 5.7 KREPAIR AND DIAGNOSIS (SINGLE PAGE)DRIVELINES & AXLESDIFFERENTIALS & DRIVE AXLESDRIVE AXLE - 7.5" - 9.5"ADJUSTMENTSBACKLASH & FINAL ASSEMBLY
1992 GMC Magnavan 5.7 K
Backlash & Final Assembly
1992 GMC Magnavan 5.7 KSECTION Backlash & Final Assembly
- Rotate pinion and differential case several times to seat bearings. Using a dial indicator mounted to axle housing, check ring gear backlash at 4 different teeth locations around ring gear. Install indicator in line with gear rotation and perpendicular to tooth angle.
- Pinion flange must be locked in position or held rigid while taking each backlash reading. Four backlash readings should not vary more than .002" (.05 mm).
- Total backlash reading should be .005-.009" (.13-.23 mm). If backlash is incorrect, adjust side bearing shims as necessary. After backlash adjustment is completed, perform gear tooth contact pattern check. See GEAR TOOTH CONTACT PATTERNS article in the GENERAL INFORMATION section.
- If pattern is incorrect, adjust pinion or ring gear as required. Install axle shafts, "C" locks, pinion shaft and lock bolt. Install rear housing cover and add gear oil. See Figure.NOTE: DO NOT change total shim pack thickness for each side bearing. If a shim is removed from one side, add same thickness shim to other side.
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.