Oversized K3 Shift Valve Kit
Part No. 88740-06K

The K3 clutch in Mercedes 722.9 transmissions is applied in all gears except fourth and is controlled by the K3 shift valve. Oscillation of this valve in its bore causes excess wear in the aluminum casting, which allows crucial shift signal fluid to leak to exhaust. This can result in burnt K3 clutches, delayed or harsh engagement, 4-5 issues or loss of Forward and Reverse operation. Reconditioning the bore and installing Sonnax oversized K3 shift valve kit 88740-06K eliminates this wear for restored hydraulic integrity and K3 control in all ranges.

• Hardcoat anodized aluminum valve combats premature wear
• Annular grooves help center valve in bore to reduce future side-load wear
• Matched spring provides precise calibration

Oversized Supply Pressure Regulator Valve
Part No. 88740-02

Fits either of two locations

Mercedes 722.9 transmissions often suffer shift abnormalities caused by excess wear in either or both of the supply pressure regulator valve bores. The supply pressure regulator controls the pressure supplied to solenoids, and functions similarly to solenoid pressure regulators found in Ford units. This wear allows fluid loss which prevents proper regulation of oil pressure supplied to control solenoids, resulting in harsh or soft shifts, solenoid codes, wrong gear starts, TCC apply issues, and clutch failure.

Reconditioning the bore(s) and installing Sonnax oversized supply pressure regulator valve 88740-02 restores hydraulic integrity to this circuit, restoring normal shift operation and feel in all ranges and the hardcoat anodized aluminum valve combats premature wear.

TCC apply valve 8HP

OE valve name: WK-V

Vehicles equipped with ZF8HP45, ZF8HP55 and ZF8HP70 transmissions may experience converter shudder, TCC slip, overheating and/or damaged TCC linings, and may set various TCC-related trouble codes.

These problems can be caused by wear in the TC regulated apply bore, which allows critical control fluid to escape the circuit. Reconditioning the bore and installing Sonnax oversized converter clutch apply regulator valve kit 35740-13K prevents pressure loss and restores TCC operation by eliminating excess wear.

Required tool:

F-35740-TL13

Tool kit for 15741-63K

Contents:

• Guide pin

• Reamer

• Reamer Jig

Note: 

Sonnax F-Tool kits designed to service a specific bore require the VB-FIX, a self-aligning valve body reaming fixture.

Input/Output Shaft Bushing
Part No. 95030-05

Fits units with .669" (16.98mm) dia. shaft journals only.

Package Quantity: 6

The OE bushings used at the input-to-intermediate shaft and intermediate-to-output shaft in ZF6HP19, ZF6HP26, ZF6HP28 and Ford 6R80 units have a tendency to wear out prematurely due to sub-optimal material composition.

This wear can lead to bushing failure, pressure control codes, and loss of correct pressure to the B-clutch. Sonnax input/output shaft bushing 95030-05 features superior wear characteristics, eliminating premature deterioration for worry-free operation. The upgraded material composition outperforms the OE bushing.