Vehicle Speed Sensor and Case Extension Installation: Installation

WARNING: This page is about a different car, the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Cross Sectional View Of Output Shaft Seal

Courtesy of GENERAL MOTORS CORP.

Using the J 21426 , install an output shaft sleeve (690) and an output shaft seal (691). See Special Tools .
Do not push the sleeve past the machined surface on the output shaft.

Fig 2: Locating Case Extension Case Seal

Courtesy of GENERAL MOTORS CORP.

Install the case extension to case seal (30) and the case extension (31).

NOTE: Refer to Fastener Notice .

Install the case extension to case bolts (32).
Tighten: Tighten the bolts to 45 N.m (33 lb ft).

Fig 3: View Of Transmission Speed Sensor

Courtesy of GENERAL MOTORS CORP.

Inspect the transmission speed sensor for the following conditions:
- Cracks
- Nicks
- Damage

Fig 4: View Of Speed Sensor, Retaining Bolt & O-Ring Seal

Courtesy of GENERAL MOTORS CORP.

Install a new O-ring seal (37) on the internal transmission speed sensor (36).
Install the internal transmission speed sensor (36).
Install the speed sensor retaining bolt (35).
Tighten: Tighten the bolt to 12 N.m (9 lb ft).

Fig 5: Locating Case Extension Oil Seal Assembly

Courtesy of GENERAL MOTORS CORP.

IMPORTANT: If installing a slip yoke (booted) type seal (34), position drain hole (1) toward the bottom of transmission within area shown.

Using the J 21426 and J 39440 or equivalent, install the case extension oil seal assembly (34) (model dependent). See Special Tools .