Sonnax highlights its main pressure regulator valve kit #105740-12K, which the company says can eliminate low line pressure, delayed engagement, poor shift quality, burnt clutches and various shift concerns in GM 10L80 (Gen. 1) and Ford 10R80/10R140 transmissions.
Sonnax says this kit includes advanced design features like an extended outboard spool that is 270% longer than OE and actuates in unworn areas of the bore.