Vehicles with Ford 4R70E, 4R70W, 4R75E, 4R75W and AODE transmissions often have erratic line pressure, poor line rise and/or throttle-sensitive buzz. This can result in harsh or soft shifts and band/clutch failure as well as other drivability concerns. Worn pressure regulator valve spools allowing pressure escape are a common problem in these units. Installing Sonnax main pressure regulator valve S76741PA-1 restores normal line pressure operation in all ranges. If bore is excessively worn, install Sonnax oversized pressure regulator and boost valve kit 76948-17K. Sonnax valve replaces both styles of OE valve found in '96-later units. Hardcoat anodized aluminum valve combats premature wear; Annular grooves help center valve in bore to reduce side-loading; Drop-in Zip Valve parts install quickly and easily