I finally got my 3.73 gears installed. I had AZ Diff do the work because the shop that was going to do the install flaked on me. I have not had a chance to really notice any improvement until I get them broken in. I will say that AZ Diff did a great job. I had heard good and bad things about the shop, but Bill was very helpful and did the work today even though it was a Saturday. Took it in at 9a and it was done by noon. He was very helpful and gave me a lot of information on how to properly break them in. I need to go back after about 3000 miles to have the gear oil changed. Overall I had a pretty good experience. Now I just need to rack up about 500 miles, before I can see what they can do.