GM 4L60-E, 4L65-E, 4L70-E Pinless Forward Accumulator Piston Kit

T r a n s mis s ion Part s Instructions

GM 4L60-E, 4L65-E, 4L70-E

Pinless Forward Accumulator Piston Kit Part No.

77987-01K

• Pinless Accumulator Piston • D-Ring • PTFE Seal • Steel Balls (2) Patent No. 6,899,211

Pinless Accumulator Piston with Seals

Steel Balls OE Spring

Also Available

OE Cover

Replacement Seal Kit

OE Screws

77987-SK

Pinless Accumulator Piston Kit 77998-03K For 1-2 or 3-4 Accumulator Bore Figure 1

1. Disassembly Remove and discard OE piston, pin and seal (do not reuse the OE D-ring seal). Retain OE spring, cover and screws for reuse. 2. Installation a. Clean and inspect the bore.

Steel Balls Press into bore.

b. Plug the pin bore in bottom of accumulator bore by installing both the Sonnax balls (Figure 1). Lightly stake the pin bore after pressing in the balls. c. Install the Sonnax D-ring seal in groove nearest the closed end of the piston (Figure 2).

D-Ring Seal

d. Install the Sonnax PTFE seal in groove nearest the open end of the piston (Figure 2). 3. Reassembly a. Lubricate seals. b. Install the Sonnax piston with new seals into the bore. The closed end of the piston with D-ring should be facing toward balls as shown in the main photo. c. Reinstall OE accumulator spring.

Closed End

PTFE Seal

Figure 2

D-Ring Seal Open End PTFE Seal

d. Reinstall OE cover and hardware. ©2012 Sonnax Industries, Inc. 800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com

77987-01K-IN 12-19-12