Sonnax highlights its adjustable rear servo pin kit (part number 34912-01K), which allows users to replace servo pins in GM TH400 and 1995 and earlier 4L80-E transmissions.
OE pins have seven different lengths to allow for adjustment of the Low/Reverse band but are no longer available from GM. This pin kit has an adjustment range covering the five longest OE pins, allowing accurate setting of the Low/Reverse servo piston travel, the company says.