Make sure you guys are running a minimum of 110lbs. to the solenoid. Some delay boxes or timers allow for a long electric pulse. Use the short one. There is a bunch of stuff that goes wrong over time with the slamming of the piston into the block. I always hated that little radius taken out of the block right where the piston slaps it. Modifying the bracket will give the piston a better angle to hit the block. If you grab the shifter you will go from 1st to 3rd every time. You have to slap it when shifting manually.