Symptoms:

  • Low line pressure
  • Various shift concerns
  • Delayed engagement
  • Poor shift quality
  • Burnt clutches

Cause:

Continuous oscillation of the pressure regulator valve causes valve body bore wear, allowing line pressure signal oil to cross-leak to the exhaust. This results in line pressure irregularities and valve instability.

Correction:

Recover hydraulic control and renew line pressure performance by reconditioning the bore and installing Sonnax oversized main pressure regulator valve kit.

10L60 (Gen. 1), 10L80 (Gen. 1), 10L90 (Gen. 1), 10R140, 10R60, 10R80, 10R90

Oversized Main Pressure Regulator Valve Kit
Part No. 105740-20K


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

Wear in the main pressure regulator bore and on the outboard spool area of the valve is common in listed GM and Ford 10-speed RWD transmissions. This wear minimizes line pressure control, resulting in delayed shift engagement, poor shift quality and burnt clutches.

Reconditioning the bore and installing Sonnax oversized main pressure regulator valve kit 105740-20K eliminates the leakage of line pressure signal oil to exhaust with the incorporation of an extended front valve spool. This valve spool is 270% longer than the OE spool, allowing for better sealing contact and a more stable operating valve. The O-ringed end plug provides a positive seal and prevents critical signal fluid from leaking to exhaust. Both of these Sonnax features ensure your units will have proper line pressure control through all drive ranges.

  • Extended outboard spool is 270% longer than OE, allowing greater sealing ability and valve stability
  • O-Ringed end plug provides positive seal to prevent critical signal fluid from leaking to exhaust
  • Hardcoat anodized aluminum valve combats premature wear
  • Annular grooves help center the valve in the bore to reduce future side-load wear
  • Included are two new springs that restore OE pressure specifications
  • O-Rings (2) 1 Extra
  • Valve
  • Spring Red, Large Dia.
  • Spring Small Dia.
  • End Plug

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 10R60, 10R80, 10R90, 10R140 Valve Body Layout

 Ford 10R60, 10R80, 10R90, 10R140 Valve Body Layout
  • 10L60 (Gen. 1), 10L80 (Gen. 1), 10L90 (Gen. 1), 10R140, 10R60, 10R80, 10R90 Oversized Main Pressure Regulator Valve Kit 105740-20K
  • 10L60 (Gen. 1), 10L80 (Gen. 1), 10L90 (Gen. 1), 10R140, 10R60, 10R80, 10R90 Oversized Main Pressure Regulator Valve Kit 105740-20K

You need this if...

10L60 (Gen. 1), 10L80 (Gen. 1), 10L90 (Gen. 1), 10R140, 10R60, 10R80, 10R90 Oversized Main Pressure Regulator Valve Kit Vacuum Test Locations