Seal
Part No. MB-O-10

Tool w/ 46892-03 4F27E, FN5 722.9

• Reamer 
• Reamer Jig 
• Guide Pin 

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