Tool Required VB-FIX Required

Printpartsummary
Symptoms:
  • 2-3 Bump
  • 2-3 Flare
  • 2-3 Harsh
  • Slipping
Cause:

Wear at the overlap valve bore prevents proper exhaust of the disengaging clutch pressure, altering the precise timing required in the clutch-to-clutch shift transition.

Correction:

The improved Sonnax overlap valve kit restores hydraulic sealing integrity and valve timing when installed in a refurbished bore.

Tool Required VB-FIX Required

722.6

Oversized 2-3 Overlap Valve Kit

Part No.

68942-27K

Oversized 2-3 Overlap Valve Kit
  • 68942-27k_combo

  • Oversized 2-3 Overlap Valve Kit

Small_68942-27k_combo Small_68942-27k

722.6

Oversized 2-3 Overlap Valve Kit

Part No. 68942-27K

  • Plunger Valve
  • Plunger Sleeve
  • Overlap Valve
  • Spring
  • O-Ring

Complaint:

  • 2-3 Bump
  • 2-3 Flare
  • 2-3 Harsh
  • Slipping

Cause:

Wear at the overlap valve bore prevents proper exhaust of the disengaging clutch pressure, altering the precise timing required in the clutch-to-clutch shift transition.


Correction:

The improved Sonnax overlap valve kit restores hydraulic sealing integrity and valve timing when installed in a refurbished bore.

The 722.6 transmission uses clutch-to-clutch transitioning during shifts, so timing is very critical to prevent shift complaints like flares or bind-ups. The overlap valves, controlled by EPC (modulated pressure) and shift valve pressure, are used to gradually reduce the pressure to the disengaging clutch. The replacement spring and valve ratios maintain OE shift pressures for proper timing and function.

  • The oversized hard-coat anodized valve has slightly longer critical spool diameters and optimized annular groove placement for better hydraulic sealing and to prevent future bore wear.
  • The wear-resistant plunger sleeve has an added O-ring to provide additional positive sealing in the bore

Required Tools

You need this if...

A vacuum test at either port indicated fails to hold 18" of vacuum or higher, or if visual wear is detected at the inboard overlap valve bores.

  • Test Locations

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Valve Body Layouts

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

Valve Body Layout Mercedes 722.6

Related Tech Articles

Sonnax

Mercedes 722.6 Vacuum Test Guide

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