Looking for 3.73 gears

[trinic]

I believe the truck is running 2.93 or so at the moment in the 12 bolt. I'd like to move up to 3.73 gears. A few questions..
1. What brand/make/supplier should I look for?
2. Will I need to change to a different size carrier? I'm currently running a size 3 if I'm not mistaken. Some people say I can still use the size 3 with 3.73 gears, and not have to move up to a size 4.
3. Anyone in North Texas (Dallas), that recommends a shop or an individual to do the swap at a resonable price?
Any input would be greatly appreciated.
Thanks,
T. C.