Change Gears in 8 3/4 RearEnd

I have a question about finding someone local that can help swap out gears in a rear end I have. It is fully removed and currently has a set of 4.56 gears and want to change to a set of 3.73. It is a 742 case. I am in Central Indiana and looking for a shop that could handle this swap.

Also looking to update the Axles to 5x4.5 bolt pattern... who would you recommend for these?