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 MANUALSCHEVROLET1985STEP VAN P30, 5.7 M, AUTOMATIC, 400/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)STEERINGPOWER STEERINGSTEERING GEAR - POWEROVERHAULSTEERING GEAR OVERHAULDISASSEMBLY
1985 Chevrolet Step Van P30, 5.7 M, Automatic, 400/M40
Steering Gear Overhaul: Disassembly
1985 Chevrolet Step Van P30, 5.7 M, Automatic, 400/M40SECTION Disassembly
- Cap all openings in gear and clean gear exterior throughly. Mount gear in vise so that pitman shaft points downward. Rotate housing end plug retainer ring until one end of plug is over hole in housing.
- Force end of ring from groove in housing and remove. Rotate input shaft counterclockwise to force housing end plug out of housing. Rotate input shaft clockwise 1/2 turn to draw rack/piston inward. Remove piston end plug.CAUTION: DO NOT rotate shaft more than is necessary to remove plug as ball bearings will fall out of worm and rack piston assembly.
- Remove lock nut from sector shaft adjuster. Remove sector shaft cover. Remove and discard "O" ring from cover. Turn input shaft until sector shaft teeth are centered in housing.
- Tap end of sector shaft with a soft-faced hammer to free shaft from housing, then remove sector shaft. Remove adjuster plug lock nut. Remove adjuster plug with a spanner wrench.
- Insert a rack/piston arbor into the end of the rack/piston until arbor just contacts worm shaft. Turn stub shaft counterclockwise to force rack/piston onto arbor. Remove the rack/piston and arbor as an assembly.
- Take care to keep arbor fully inserted so ball bearings will not fall out. Remove input shaft and control valve assembly from housing. Remove worm, wormshaft lower thrust bearing, and races from 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.