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.

• New spring matches OE calibration
• Hardcoat anodized aluminum valve combats premature wear
• Annular grooves help center valve in bore to reduce future side-load wear