Sonnax has introduced a new oversized low reverse/overdrive (4-5-6) clutch regulator valve kit (part no. 144740-43K) for Ford 6F35 transmissions, generations 1 and 2.
Sonnax says that users can restore the correct valve/bore clearances and clutch control in these transmissions by reconditioning the bore and installing this kit. This kit includes a new spring that matches OE calibration and an O-ringed end plug that provides positive sealing, Sonnax notes.