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 130 (AUTOMATIC TRANSAXLE SERVICING)REMOVAL & INSTALLATIONCASE EXTENSION HOUSINGREMOVAL
1999 GMC Forward Control 5.7 R, Automatic
Case Extension Housing: Removal
1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal
WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect the negative battery cable. Raise and support the vehicle. Disconnect the right drive axle from the transaxle. See appropriate AXLE SHAFTS article in DRIVELINE/AXLES.
- Remove transaxle brace. See TRANSAXLE BRACE . Remove the vehicle speed sensor. See VEHICLE SPEED SENSOR .
- Remove the case extension housing bolts. See Fig 1
. Remove the case extension housing with axle seal and the O-ring. Inspect the case extension for the following conditions:
- Damaged or porous sealing surface for the case extension seal.
- Damaged or porous sealing surface for the vehicle speed sensor.
- Damaged or porous sealing surface for the right drive axle oil seal.
- Damaged or porous sealing surface for the case extension housing.
- Damaged or worn differential carrier bushing or output shaft bearing.
- Damaged bolt holes.
- Inspect the drive axle seal and replace if necessary.
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.