I used to be a long time active poster here long ago and have since lost my contacts since I no longer have the Mustang. I was hoping someone from the Bay Area would be able to provide some info. If I remember correctly, this place would install the gears for the cheapest place in the area, with no issues.
I used to work in Pleasant Hill. I had a set of gears installed at Stock to Performance in Concord, CA. They are very good, they work mostly on hot rods, they can do just about anything.