77998 03K IN

2017-11-22

: Sonnax 77998-03K-In 77998-03K-IN 2520 instructions part uploads

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T R A N S M IS S ION PART S
Instructions

GM 200-4R, 4L60, 4L60-E, 4L65-E & 4L70-E

Pinless Accumulator
Piston Kit

Pinless
Accumulator
Piston

Part No.

77998-03K

•	Pinless Accumulator Piston
•	D-Ring, Viton®
•	Seal, PTFE
•	Steel Ball (1) .312" dia.
•	Steel Ball (1) .236" dia.

D-Ring

Seal

Case
3-4 Location

Patent No. 6,899,211

Steel Balls
(1-2 Location Only)

Figure 1
Drive OE pin out of cover. Plug pin bore by driving
the appropriately-sized Sonnax steel ball into it.
Lightly stake bore after ball installation.

1. Disassembly
a. Remove OE piston and spring from 1-2 or 3-4 accumulator bore.
Discard piston, save spring for reuse.
	
	

NOTE: Some aftermarket shift kit springs do not fit properly into Sonnax pistons.
In these cases, an OE spring must be sourced or Sonnax spring 74926 can be used.

b. Remove and discard OE pin.
c. For 1-2 location, plug pin bore by driving the appropriately-sized Sonnax
steel ball into it. Lightly stake bore after ball installation (Figure 1).
	

	
1-2
Location

NOTE: OE pin diameter varies. Install ONLY the Sonnax steel ball that

corresponds to pin bore size. Discard unused steel ball.

d. For 3-4 location, no steel ball is necessary as this is a blind hole.
2. Installation & Assembly
a. Install Sonnax D-ring into groove at dome end.
b. Install Sonnax PTFE seal into groove at open-pocket end.
c. Continue installation as noted below:
OpenPocket
End

	
‘94-Earlier
		
• 3-4 Piston: Install dome into case with spring in pocket.
		• 1-2 Piston: Install dome into accumulator body followed by spring.
	
‘94-Later
		 • 3-4 Piston: Install dome into case. Some units do not have a spring
for 4th accumulator. If OE had a spring, install into piston pocket.

Dome
End

PTFE
Seal
Viton Rubber D-Ring
®

©2017 Sonnax Industries, Inc.
800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com

		 • 1-2 Piston: Install spring(s) into accumulator body, set piston pocket
opening onto spring, dome toward plate.
	
200-4R (All)
		
• 3-4 Piston: Install dome into case with spring in pocket.
		• 1-2 Piston: N/A.
77998-03K-IN 10-23-17
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