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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 873 (AUTOMATIC TRANSAXLE - AF33-5 (TROUBLESHOOTING))DIAGNOSTIC INFORMATION & PROCEDURESROAD TEST PROCEDUREPROCEDURE
1999 GMC Forward Control 5.7 R, Automatic
Road Test Procedure: Procedure
1999 GMC Forward Control 5.7 R, AutomaticSECTION Procedure
WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
PARK Range Test
- Park the vehicle on a grade of greater than 5 degrees.
- With the gear selector in the PARK position, release the service and parking brakes if applied. There should be little or no initial movement in the vehicle. This procedure is done to verify that the park pawl (702) is properly engaged with the front differential transfer drive gear assembly (14).
DRIVE Range Test
- Road test the vehicle in order to verify that the automatic transmission assembly has the correct up-shift, down-shift, kick-down and torque converter clutch (TCC) lock up operation at the shift points as listed in the Shift Speed table.
- Decelerate the vehicle in order to verify correct engine brake operation.
- Verify that there is no abnormal shock, noise, slip, and/or harshness during the course of normal operation.
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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.