- Erratic buzz
- Low line rise
- Low Reverse boost
- Poor shift quality
- Premature band failure
- Premature clutch failure
- Soft shifts
- Uncontrolled pressure in Reverse
Regulator valve wear allows critical fluid loss that results in driveability concerns.
Renew pressure regulator performance and revive line pressure control by installing Sonnax main pressure regulator valve.
Main Pressure Regulator Valve
Replaces '95-Earlier 4-spool valves only. DOES NOT replace 3-spool valves.
Vehicles with 4R70W 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 driveability concerns. Worn pressure regulator valve spools allowing pressure escape are a common problem in these units. Installing Sonnax main pressure regulator valve 76948-01 restores normal line pressure operation in all ranges.
If bore is excessively worn, install Sonnax oversized pressure regulator and boost valve kit 76948-16K.
- Hardcoat anodized aluminum valve combats premature wear
- Annular grooves help center valve in bore to reduce side-loading
'91–'95 PR valve and '96-later PR valve designs are not interchangeable. For '96-later PR valve, see 76948-09.
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.
Click here to view PDF if instructions do not appear below.
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