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 MANUALSGMC1986SUBURBAN 3/4 TON 4WD V8-454 7.4LPARTS AND LABORTRANSMISSION AND DRIVETRAINMANUAL TRANSMISSION/TRANSAXLEPARTS INFORMATION
1986 GMC Suburban 3/4 Ton 4WD V8-454 7.4L
Parts Information
1986 GMC Suburban 3/4 Ton 4WD V8-454 7.4LSECTION Parts Information
| Part | Manufacturer | OEM Part # | Price | Notes |
| 4 Speed Hydromatic M20 | ||||
| Trans Assembly | ||||
| 10-20 Series | GMO | 15597790 | 1275.00 | Contact Dealer for most current part and price information. |
| 30 Series | GMO | 15597789 | 1275.00 | Contact Dealer for most current part and price information. |
| 4 Speed New Process | ||||
| Speedo Gear | GMO | 14071755 | 13.00 | Contact Dealer for most current part and price information. Order BY Gear Ratio. |
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.