Symptoms:

  • No engine braking in D1
  • Burnt Low/Reverse clutch
  • Low/Reverse clutch distress

Cause:

Wear at the Low/Reverse modulator plunger valve sleeve bore due to continuous oscillation.

Correction:

Restore critical clearances and recover hydraulic control by installing Sonnax drop-in low/reverse modulator plunger valve kit.

4R100, E4OD

Low/Reverse Modulator Plunger Valve Kit
Part No. 36947-06K

Fits '96-later.

View Instructions Find a Distributor

In Ford 4R100 and E4OD units, the Low/Reverse modulator plunger valve uses line pressure to control the position of the Low/Reverse modulator valve. Due to continuous oscillation of the plunger valve, wear occurs at the I.D. of the sleeve, allowing line pressure to leak to exhaust. The Low/Reverse modulator valve is prevented from properly supplying regulated line pressure to the Low/Reverse clutch, which can cause slippage, burnt clutches and loss of engine braking. Sonnax Low/Reverse modulator plunger valve kit 36947-06K renews critical clearances and restores normal clutch operation.

  • Sleeve is made from highly wear-resistant aluminum
  • Hardcoat anodized aluminum valve combats premature wear
  • Drop-in Zip Valve parts install quickly and easily
Learn More About Zip Valve™ Drop-In Repairs
  • Sleeve
  • Plunger Valve

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.

Ford E4OD, 4R100 Valve Body Layout

Ford E4OD, 4R100 Valve Body Layout
  • 4R100, E4OD Low/Reverse Modulator Plunger Valve Kit 36947-06K
  • 4R100, E4OD Low/Reverse Modulator Plunger Valve Kit 36947-06K