[CaptRMW]

Now the really simple way to check the clearance. No need to remove the solenoid. Bolt your starter up and line up a flexplate tooth exactly facing the starter shaft. Using the smooth shank of an 1/8" drill bit check the clearance between the starter shaft and the flexplate tooth. Shim the starter until the clearance between the ring gear tooth and the starter shaft is close to snug on the bit. Your starter will reward you if you take the time necessary to get this right.