Using Seal Installer (J-26938 or J-29130), install new axle oil seal and seal guard. Install detent spring and roller assembly. If 1-2 accumulator piston seal was removed, install new seal ring. Install 1-2 accumulator piston (flat side down).
Install 1-2 accumulator piston pin. Install manual valve assembly with small diameter first. Using a 3/8" drift, replace manual valve cup plug. Coat cup plug with sealant before installation. With new "O" ring on electrical connector, install connector with tab located at case slot.
If removed, install thermostatic element roll pins into case. Using Roll Pin Height Checker (J-29023), adjust installed height of center roll pin to .24" (6 mm). See Fig 1 . Recheck thermostatic element roll pin installed height. Install thermostatic element plate.
Install thermostatic element onto roll pins. Place Roll Pin Height Checker (J-29023) against roll pin, between case surface and thermostatic element.
Install roll pin retainers, and tap down onto roll pins until element contacts touch. Set roll pin washer height after installing and setting center roll pin height.
Set roll pin retainer height to .21" (5.3 mm). See Fig 2 . Adjustment is important for thermostatic element operation. Thermostatic element controls fluid level in control valve cover oil sump.

Fig 1: Measuring Center Roll Pin Installed Height

Courtesy of GENERAL MOTORS CORP.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Case Cover: Reassembly