Hey, sorry for the late reply. In my case the air plumbing was backward in one side of the air cylinder. From what I remember, proper operation is: no power to the solinoids, it should go to third ( air cylinder extended). One solinoid gets power and retracts one side of the air cylinder for second, both solinoids get power and fully retract the cyl. for first. I assume you have already bypassed the shift controller. Check the solinoids and that the exhaust isn't plugged. Check that the air cylinder is working right. Hope it helps.