November 14, 2016
Many 4R70E, 4R70W, 4R75E, 4R75W and AODE units have a loose manual valve or worn bore that creates a significant line pressure leak. Loss of line pressure results in delayed engagements, burnt clutches and bands. OE manual valves have been observed continuously rotating in the bore due to forces caused by the flow of fluid. Constant rotation of the valve contributes to premature wear of the valve bore. The Sonnax tool kit F-76948-TL46 reconditions the bore to accept the Sonnax oversized manual valve kit 76948-46. This manual valve eliminates the constant axial rotation and its precision machining tightly controls clearances to minimize line pressure leaks.
Upgrades '92-'98 valve bodies to '99-later specifications. The '99-later units have a quicker direct clutch exhaust on 4-2 manual downshift.
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.
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.