Symptoms:

  • Delayed engagement
  • Low line pressure
  • Burnt bands
  • Burnt clutches

Cause:

Listed units frequently have loose or worn manual valves which allow critical line pressure to cross leak into adjacent hydraulic circuits or to the exhaust.

Correction:

Sonnax oversized manual valve kit restores proper clutch/band clamping forces and actuation timing by eliminating critical line pressure leaks between the manual valve and valve body. Additionally, the design of this manual valve eliminates valve rotation caused by pressurized fluid acting on the valve while flowing through the valve body.

4R70E, 4R70W, 4R75E, 4R75W, AODE

Oversized Manual Valve Kit
Part No. 76948-46


You need this if... View Instructions Find a Distributor

Many 4R70E, 4R70W, 4R75E, 4R75W and AODE units have a loose manual valve or worn bore that creates a significant line pressure leak. Loss of line pressure results in delayed engagements, burnt clutches and bands. OE manual valves have been observed continuously rotating in the bore due to forces caused by the flow of fluid. Constant rotation of the valve contributes to premature wear of the valve bore. The Sonnax tool kit F-76948-TL46 reconditions the bore to accept the Sonnax oversized manual valve kit 76948-46. This manual valve eliminates the constant axial rotation and its precision machining tightly controls clearances to minimize line pressure leaks.

  • Eliminates line pressure losses to cross leaks
  • Establishes tight clearances between manual valve spools and bore lands
  • Ends flow-induced axial rotation of manual valve

Fits '92-later units. Upgrades '92-'98 valve bodies to '99-later specifications. The '99-later units have a quicker direct clutch exhaust on 4-2 manual downshift.

  • Valve
  • Retaining Ring
  • 4R70E, 4R70W, 4R75E, 4R75W, AODE Oversized Manual Valve Kit 76948-46
  • 4R70E, 4R70W, 4R75E, 4R75W, AODE Oversized Manual Valve Kit 76948-46

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.

4R70E, 4R70W, 4R75E, 4R75W, AODE Oversized Manual Valve Kit Vacuum Test Locations