Hey Scotty I had a very strange starter shim occurrence with my 1975 GMC Vandura. When I bought it I was told it needed a starter shim, so when I went out and bought a starter shim and was surprised to find out that it didn’t help the noise level whatsoever I assumed it just needed another starter shim. Anyways, so about a week after I put the first one in I ended up having to put 2 more in and to my absolute unbelief, it didn’t help the noise level whatsoever. In fact, I think it might have made it work. Anyways, so when I discovered that I removed all 3 starter shims and and tried starting it and once again, to my unbelief, it fixed the problem (the noise). What in the hillbilly hell is going on?