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 MANUALSCHEVROLET1990HI-CUBE 7.4 N, 400/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)DRIVELINES & AXLESDIFFERENTIALS & DRIVE AXLESDRIVE AXLE - FULL FLOATINGOVERHAULDISASSEMBLYDIFFERENTIAL CASE
1990 Chevrolet Hi-Cube 7.4 N, 400/M40
Differential Case
1990 Chevrolet Hi-Cube 7.4 N, 400/M40SECTION Differential Case
- Properly support rear axle assembly. Remove differential cover bolts and cover. Drain lubricant from axle. Remove axle shafts. See AXLE SHAFTS in REMOVAL & INSTALLATION.
- Remove bearing cap bolts. Note letters on caps and drive axle housing for reassembly reference. Remove differential bearing caps. See Fig 2. Mount dial indicator on differential housing. Preload dial indicator to .020" (.51 mm), then rotate gauge to zero dial.
- Use Drive Axle Housing Spreader (J-24385-01) to spread drive axle housing out .015" (.38 mm). See Fig 1. DO NOT spread housing more than specified as housing will be damaged. Pry differential case out of housing.
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.