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Brand: Sonnax

Type: Valve Body 

Interchange Part Number: S76741PFK

Manufacturer Warranty: Yes

Fitment Type: Direct Replacement

Items Included: Pressure Regulator

Manufacturer Part Number: 76948-17K

Material: Aluminum

Universal Fitment: Yes

Vintage Part: No

Performance Part: Yes

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

Oversized Pressure Regulator & Boost Valve Kit
Part No. 76948-17K

Fits '96-later only.

Tooling:
  • F-76948-TL
  • 76948-TL4
  • 76948-BST
  • VB-FIX
  • VB-FIX
Common complaints in vehicles with listed Ford transmissions is low line pressure resulting in band and/or clutch failure, or throttle-sensitive buzz, especially when hot. These issues can be caused by severe wear at the outboard pressure regulator valve spool or bore area. Wear at this location allows EPC oil to leak to exhaust, resulting in poor line rise. As oil temperature increases it becomes less viscous, an more leakage occurs. Wear at the inboard balance spool bore is also very common, which can result in excessively high line pressure that can damage the case. Sonnax oversized pressure regulator and boost valve kit 76948-17K restores valve-to-bore clearances so the pressure regulator valve can maintain correct pressures.
  • Improved PR/EPC reaction area ratio provides higher line rise response to EPC pressure, which results in noticeably firmer shifts
  • Hardcoat anodized aluminum PR valve combats premature wear
  • Annular grooves added to PR valve prevent side-loading wear

There are two reaming options available for this kit. Either tool kit works for all model years.

  • Reaming Option 1: Tool kit F-76948-TL. This option includes reamer, reamer jig and guide. It requires reaming fixture VB-FIX, but not bore sizing tool.
  • Reaming Option 2: Tool kit 76948-TL4. This is a bench tool kit and does not require the VB-FIX. After reaming with [76948-TL4, use bore sizing tool 76948-BST (sold separately) to provide exact sizing and improved bore finish.
  • Pressure Regulator Valve
  • Boost Valve
  • Boost Sleeve

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