3/5/Reverse clutches in listed Hyundai/Kia units are applied in Reverse, third and fifth gears in conjunction with other clutch packs. As the 3/5/R pressure control valve oscillates and strokes over time, bore deterioration results, which prevents proper hydraulic control of the 3/5/R clutches. This can cause flares, slipping, erratic clutch apply timing, ratio codes, loss of Reverse, and burnt clutches.
The Underdrive brake clutch is applied in first through fourth gears in conjunction with other clutch packs, and is susceptible to the same excess bore wear, causing similar concerns.
Reconditioning either or both bores and installing Sonnax oversized 3/5/Reverse and Underdrive pressure control valve kit 102741-13K restores normal shift operation and clutch control by shoring up the hydraulic integrity of these circuits.
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.