Vehicle Speed Sensor and Case Extension Installation

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
Courtesy of GENERAL MOTORS CORP.
1. 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.
2. Install the case extension to case seal (30) and the case extension (31).
NOTE: Refer to Fastener Notice .
3. 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.
4. 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.
5. Install a new O-ring seal (37) on the internal transmission speed sensor (36).
6. Install the internal transmission speed sensor (36).
7. 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.
8. Using the J 21426  and J 39440  or equivalent, install the case extension oil seal assembly (34) (model dependent). See Special Tools .