2-4 Servo Assembly Installation

Tools Required

• J 22269-01  Accumulator and Servo Piston Remover. See Special Tools .
• J 29714-A  Servo Cover Depressor. See Special Tools .

Fig 1: 2-4 Servo Assembly Components
Courtesy of GENERAL MOTORS CORP.
1. Inspect the 4th apply piston (25), the 2-4 servo cover (28), the 2nd apply piston (17), and the servo piston inner housing (20) for the following conditions:
   • Cracks
   • Scoring
   • Burrs and nicks
2. Install the following seals:
   • The 4th apply piston outer oil seal ring (26) on the 4th apply piston (25).
   • The 2-4 servo cover O-ring seal (27) on the 2-4 servo cover (28).
   • The 2nd apply piston outer (18) and inner (19) oil seal rings on the 2nd apply piston (17).
   • The O-ring seal (21) on the servo piston inner housing (20).
Fig 2: Locating Servo Cushion Outer & Inner Spring With Retainer
Courtesy of GENERAL MOTORS CORP.
3. Install the servo cushion outer spring (16), the servo cushion inner spring (105) (model dependent) and the cushion spring retainer (15) in the 2nd apply piston (17).
4. Use the J 22269-01  and compress the second apply piston assembly (17). See Special Tools .
5. Install the second apply piston retaining ring (14).
Fig 3: Assembling 2-4 Servo Components
Courtesy of GENERAL MOTORS CORP.
6. Assemble the 2-4 servo components in the order shown: (12-15, 17, 20, 22-25, 28, 29).
Fig 4: 2-4 Servo Assembly
Courtesy of GENERAL MOTORS CORP.
7. Install the 2-4 servo assembly into the 2-4 servo bore.
Fig 5: Installing J 29714-A To Transmission Case
Courtesy of GENERAL MOTORS CORP.
8. Install the J 29714-A  . See Special Tools .
Fig 6: Compressing Servo Cover With J 29714-A
Courtesy of GENERAL MOTORS CORP.
9. Tighten the bolt on the J 29714-A  in order to compress the servo cover. See Special Tools .
Fig 7: Locating Servo Cover Retaining Ring
Courtesy of GENERAL MOTORS CORP.
10. Install the servo cover retaining ring.