I have a 2000 chevy blazer that keeps taking out starter drives. Fly wheel has been changed and gone through 3 starters, 2 new and original. The first start of the day is the worst or after it sits for awhile. Also changed out distributer cap and put on new wires.

 

Sounds like the starter gears are not mating with the flywheel. You probably need to get a shim pack from the auto supply and play around with the various thicknesses to find the right amount to get the starter to line up correctly.

 

tried shims that didn't help.