Speed Sensor and Case Extension Installation

WARNING: This page is about a different car, the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Tools Required

J 21426 Rear Seal Installer. See Special Tools .
J 39440 Extension Housing Seal Installer or equivalent. See Special Tools .

Fig 1: Cross Sectional View Of Output Shaft Seal

GM588788

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

GM588790

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

GM1462840

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

GM1462842

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

GM207641

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 .