The 8 1/4 thread

I had to move it 3/16 I drilled a small hole where I thought the casting would be the thinnest and it was .450 thick So now the wall section should be 1/4 on that side of the carrier That side is the farthest away from the ring gear so its not taking the same load. This is just a driver so I should be OK and I'm starting to build a 8 3/4
So did you have to make a shim for the other side?