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 & PROCEDURESTRANSMISSION FLUID CHECKING PROCEDUREPROCEDURE
1999 GMC Forward Control 5.7 R, Automatic
Transmission Fluid Checking 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.
Inspect ATF Level
- Park the vehicle on a flat level surface.
- Confirm that the ATF temperature is at normal operating range of 60-70Β°C (140-158Β°F).
- With the engine at a base idle, apply the service brakes and then slowly move the automatic transmission gearshift selector through all ranges, returning to the PARK position.
- Remove the fluid level indicator and wipe the fluid level indicator with a clean, lint free cloth. Reinsert the fluid level indicator into the fluid level indicator tube making sure that the fluid level indicator is fully seated into the fluid level indicator tube.
- Remove the fluid level indicator and verify that the ATF level is within the "HOT" level markings as indicated on the fluid level indicator.
- Adjust the ATF level as necessary, by adding or draining ATF, in order to obtain the desired reading in the "HOT" range on the fluid level indicator.
IMPORTANT:
ATF level increases as it heats up. Therefore, inspect the ATF level at its normal operating temperature, on a flat level surface, to ensure accuracy.
IMPORTANT:
If the AFT level on the fluid level indicator is different from front to back when inspecting, add or remove ATF until the lower of the two readings is within the correct level.
Inspect ATF Condition
- Inspect the condition of the ATF in order to make sure that the following signs are NOT present:
- Mixing of metal particles and or excessive disc friction material
- Burnt smell
- Black color
- No white-colored (engine coolant cross contamination)
- If there are signs of the above conditions, remove the automatic transmission assembly and disassemble to inspect and or replace as necessary. Be sure to flush the oil cooler lines and the cooler assembly as necessary.
- "White-colored/milkshake ATF" is caused by mixing of water/engine coolant. Therefore, inspect the oil cooler system for signs of damage and repair as necessary. Refer to Automatic Transmission Oil Cooler Flushing and Flow TestΒ .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.