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 MANUALSCHEVROLET2003EXPRESS 1/2 TON VAN V6-4.3L VIN XREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINAUTOMATIC TRANSMISSION/TRANSAXLESERVICE AND REPAIROVERHAUL4L80-E/4L85-E AUTOMATIC TRANSMISSIONREPAIR INSTRUCTIONS99. CASE EXTENSION ASSEMBLY INSTALLATION
2003 Chevrolet Express 1/2 Ton Van V6-4.3L VIN X
99. Case Extension Assembly Installation
2003 Chevrolet Express 1/2 Ton Van V6-4.3L VIN XSECTION 99. Case Extension Assembly Installation
^ Tools Required
- J 38694 Extension Housing Seal Installer
- J 38869 Extension Seal Installer
- J 36850 Assembly Lubricant
1. Install the prop shaft front slip yoke oil seal (20) (model dependent) with the J 38869 or the J 38694 for fixed yoke applications. Apply J 36850 or equivalent to the spring pocket of the seal.
2. Install the transmission output shaft yoke seal (682) and the output shaft seal (683) (some models).
3. Install the output shaft seal (675) (some models).
4. Install the case extension seal (15) onto the case extension assembly (19).
5. Install the case extension assembly (19) onto the transmission case.
Notice: Refer to Fastener Notice in Service Precautions.
6. Install the case extension bolts (21).
^ Tighten the bolts to 34 Nm (25 ft. lbs.).
- J 38694 Extension Housing Seal Installer
- J 38869 Extension Seal Installer
- J 36850 Assembly Lubricant
1. Install the prop shaft front slip yoke oil seal (20) (model dependent) with the J 38869 or the J 38694 for fixed yoke applications. Apply J 36850 or equivalent to the spring pocket of the seal.
2. Install the transmission output shaft yoke seal (682) and the output shaft seal (683) (some models).
3. Install the output shaft seal (675) (some models).
4. Install the case extension seal (15) onto the case extension assembly (19).
5. Install the case extension assembly (19) onto the transmission case.
Notice: Refer to Fastener Notice in Service Precautions.
6. Install the case extension bolts (21).
^ Tighten the bolts to 34 Nm (25 ft. lbs.).
RENDER: 1.0x
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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.