I checked and double checked the alignment several times and everything checks good. I use a powerglide with an ultrabell and I thought maybe there is something not machined right in the bellhousing??? I don't know. The flywheel looked good when we had the motor out last time, I always inspect the teeth on it everytime the motor is out. Like I said I just don't know. There are so many people that say they just use the mopar factory mini starters and never have problems but I've had problems on the last two motors with them.