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 MANUALSCHEVROLET1990R 20 P/U 2WD V8-454 7.4LREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSDIFFERENTIAL ASSEMBLYREAR AXLENON-LOCKING DIFFERENTIALDANA 10 1/2-INCH RING GEARAVAILABLE SHIM SIZES
1990 Chevrolet R 20 P/U 2WD V8-454 7.4L
Available Shim Sizes
1990 Chevrolet R 20 P/U 2WD V8-454 7.4LSECTION Available Shim Sizes
DANA 10 1/2-INCH RING GEAR
DIFFERENTIAL BEARING ADJUSTING SHIM:
0.003 inch
0.005 inch
0.010 inch
0.030 inch
OUTER PINION BEARING SHIM:
0.003 inch
0.005 inch
0.010 inch
0.030 inch
INNER PINION BEARING SHIM:
0.003 inch
0.005 inch
0.010 inch
INNER PINION BEARING CUP AND CONE:
-B and H.D. Models 1.4375 in. wide
-U Model 1.1875 in. wide
DIFFERENTIAL BEARING CUP AND CONE:
-B and U Models 1.0000 in. wide
-H.D. Model 1.1875 in. wide
RENDER: 1.0x
NO RELATED
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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.