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 MANUALSGMC1991FORWARD CONTROL 3.9 L, NV4500/MT8REPAIR AND DIAGNOSISSTEERINGMANUAL STEERINGSTEERING SYSTEM - POWERTORQUE SPECIFICATIONS
1991 GMC Forward Control 3.9 L, NV4500/MT8
Torque Specifications
1991 GMC Forward Control 3.9 L, NV4500/MT8SECTION Torque Specifications
TORQUE SPECIFICATIONS
| Application | Ft. Lbs. (N.m) | |||
|---|---|---|---|---|
| Adjuster Plug Lock Nut | 81 (110) | |||
| Connecting Rod-To-Pitman Arm Nut | ||||
| Astro & Safari | 35 (47) | |||
| "P" Series (Motorhome & Forward Control Chassis) | 70 (95) | |||
| "V" Series | 89 (121) | |||
| Connecting Rod-To-Relay Arm Nut | ||||
| "P" Series (Motorhome) | 70 (95) | |||
| Coupling Clamp Nuts | 20 (27) | |||
| Coupling Clamp Pinch Bolt | ||||
| "G" Series | 46 (62) | |||
| "P" Series | 75 (102) | |||
| Coupling-To-Steering Shaft Flange Bolt | 20 (27) | |||
| Idler Arm Mounting Bolt | ||||
| Astro & Safari | 81 (106) | |||
| "C" Series | 78 (105) | |||
| "G" Series | 35 (47) | |||
| "R" Series & "P" Series | 30 (41) | |||
| "S" Series | 60 (81) | |||
| Idler Arm-To-Relay Rod Nut (1) | ||||
| Astro & Safari | 35 (47) | |||
| "C" Series | 40 (54) | |||
| "G" Series & "R" Series | 66 (89) | |||
| "S" Series | 35 (47) | |||
| "T" Series | 60 (81) | |||
| Pitman Arm Attaching Nut | 180 (244) | |||
| Pitman Arm-To-Relay Rod Nut (1) | ||||
| "C" Series | 40 (54) | |||
| "G" Series & "R" Series | 66 (89) | |||
| Pitman Arm-To-Steering Gear Nut | ||||
| Astro, Safari, "C", "G", "K", "P" Series Step Van & "R" Series | 184 (249) | |||
| "P" Series (Motorhome & Forward Control Chassis) | 125 (170) | |||
| "V" Series | 92 (125) | |||
| Pitman Shaft Adjuster Lock Nut | ||||
| Astro & Safari | 37 (50) | |||
| "C" & "K" Series | 32 (43) | |||
| "S" & "T" Series | 20 (27) | |||
| "G" Series, "P" Series & "R" & "V" Series | 35 (47) | |||
| Rack Piston End Plug | 50 (68) | |||
| Relay Rod-To-Relay Arm Nut | ||||
| "P" Series (Motorhome) | 66 (89) | |||
| Side Cover Bolts | 40 (54) | |||
| Steering Gear Lower Clamp Bolt | ||||
| "C" & "K" Series | 22 (30) | |||
| "S" & "T" Series | 26 (35) | |||
| Steering Gear-To-Frame Bolts | ||||
| Astro & Safari & "S" & "T" Series | 55 (75) | |||
| "C" & "K" Series | 100 (136) | |||
| "G" Series, "P" Series & "R" & "V" Series | 66 (89) | |||
| Tie Rod Clamp Nut | ||||
| "V" Series | 40 (54) | |||
| Except "V" Series | 14 (19) | |||
| Tie Rod Jam Nut | ||||
| "P" Series (Forward Control Chassis) | 277 (375) | |||
| "V" Series | 175 (237) | |||
| Tie Rod-To-Relay Rod Nut | ||||
| Astro, Safari & "S" Series | 35 (47) | |||
| "C" Series & "V" Series | 40 (54) | |||
| "G" Series & "R" Series | 66 (89) | |||
| Tie Rod-To-Steering Knuckle Nut | ||||
| Astro & Safari | 35 (47) | |||
| "C" Series & "V" Series | 40 (54) | |||
| "G" Series & "R" Series | 46 (62) | |||
| "S" Series | 35 (47) | |||
| Universal Yoke-To-Shaft Bolt | 29 (40) | |||
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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.