AFL Valve Kit

Required tool:

F-55211-TL

Boostvalve 5L40E OEM ratio

• Valve 
• Sleeve 
• O-Ring 

OE ratio, O-ring style

• Diameter: 0.474"
• Diameter: 0.441"

Vehicles with a 5L40-E transmission are prone to poor line rise or high reverse pressure problems causing poor shift quality and clutch failure due to leakage at the boost valve assembly. Sonnax offers two replacement boost assemblies: the 55209-01K large ratio (higher line rise and firmer shifts) and the OE ratio 55209-04K for factory performance.

NOTE: OE Ratio Kit

Oversized Low Pressure Control Valve Kit

The low pressure control valve applies in 1st, 2nd or 3rd gear coast conditions, when engine braking is needed. Depending on the gear and solenoid states, 1-2-3 regulated fluid pressure is routed through this valve to provide engine braking through a controlled apply of the low/reverse clutch, 2nd coast clutch or O.D. clutch.

If the bore has excessive wear, this regulated oil pressure is open to exhaust, resulting in 3-2-1 bumps on coast downshifts, no engine braking, and/or clutch failure.

The Sonnax low pressure control valve kit 55211-17K easily can be installed into are furbished bore, and incorporates design upgrades to prevent future wear concerns.

TCC Regulator Valve Kit

Overlap Control valve sleeve kit 722.6

Continuous plunger valve oscillation causes wear at the overlap control valve sleeves, allowing modulated oil pressure to exhaust or oppose the shift and create numerous shift complaints in Mercedes 722.6 units.

The highly wear-resistant Sonnax master overlap control sleeve kit 68942-05K restores necessary hydraulic control tolerances in the 1-2, 4-5 bore as well as the 2-3 and 3-4 bores.