Vehicle Speed Sensor and Case Extension Installation

Special Tools

• J 21426:  Rear Seal Installer
• J 39440:  Extension Housing Seal Installer

Fig 1: Cross Sectional View Of Output Shaft Seal
Courtesy of GENERAL MOTORS CORP.
1. Using the J 21426:  seal installer, install an output shaft sleeve (690) and an output shaft seal (691).

   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).
CAUTION: Refer to Fastener Caution .
3. Install the case extension to case bolts (32). 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 the bolt to 12 N.m (9 lb ft).
Fig 5: Locating Case Extension Oil Seal Assembly
Courtesy of GENERAL MOTORS CORP.
NOTE: 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:  seal installer and J 39440:  seal installer or equivalent, install the case extension oil seal assembly (34) (model dependent).