Review on AUTOKAY 6HP19 6HP21 Valve Sleeve by Julio Montano

A great match for my 2007 335i. They are easy to change. You'll need to remove the mechatronics gasket and double-D gasket, so take those with you as well. A Torx bit 40 and a bit 27 are required. The valve block must be removed from the vehicle. Keep everything as clean as possible. These ZF transmissions work much better if you change the solenoids as well. With a new ZF or Ford Mercon SP (same fluid), add XHP to Android, load stage 3 firmware into the car and your shifts will be close to DCT speeds. These transmissions have no problem handling a 500+ horsepower wheel as long as the fluid temperature stays below 200 F, the fluid is changed frequently, and the solenoids are changed.