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 MANUALSGMC1977FORWARD CONTROL 7.4L ENG VIN Y, AUTOMATIC TRANS, TRANS MFR CD 475/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)STEERINGMANUAL STEERINGPOWER STEERING GEARS - SAGINAW ROTARY VALVEADJUSTMENTOVERCENTER PRELOAD TORQUE

1977 GMC Forward Control 7.4L Eng VIN Y, Automatic Trans, Trans Mfr CD 475/M40

OVERCENTER Preload Torque

1977 GMC Forward Control 7.4L Eng VIN Y, Automatic Trans, Trans Mfr CD 475/M40SECTION OVERCENTER Preload Torque

Rotate input shaft from stop to stop counting number of turns. Now turn shaft back exactly halfway. Attach an INCH lb. torque wrench to input shaft. Refer to Overcenter Preload specifications and turn shaft from side to side the specified amount of arc and note torque reading going overcenter.
Loosen lock nut and turn sector adjuster clockwise until torque reading (see Overcenter Preload Specifications ) going overcenter is to specification. Total torque should not exceed 18 INCH lbs. for a new steering gear (under 400 miles) or 14 INCH lbs. for a used steering gear (over 400 miles).

OVERCENTER PRELOAD SPECIFICATIONS

Application

Arc

Overcenter Preload⁽²⁾

Chrysler Corp.

90°⁽¹⁾

4-5

Ford Motor Co.

180°

4-6

General Motors

20°4-5

International Harvester

20°4-5

Jeep

45°

4-5

⁽¹⁾	Arc on Motor Home Chassis models should be 180°......

⁽²⁾	Reading should be 4-8 INCH lbs, with total reading not to exceed 18 INCH lbs. for a new steering gear (less than 400 miles).

Fig 1: Measuring Overcenter Preload and Making Adjustment

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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.