The clearance spec is how deep the flexplate tooth extends in to the starter motor pinion. The least must be 0.040 inch. When the clearance is just too tight, a shim will increase this clearance. While you talked about, a shim did not aid so We are going to assume https://sergiomewpf.blogdal.com/35704041/hejian-nuojin-auto-parts-co-no-further-a-mystery