The 4x4 Jeep shop I use doesn't care if you supply the parts of they do as long as they OK them before install, as any decent shop should. I used Motive Gears and Master install kits from Rustys Off Road good prices for the D30/Chy 8.25. The shop told me the install kits were top notch also when they did the gears (4.56's) I had them install Detroit Lockers in both the cost was $200 per differential for gear and locker.
The shop has been around for almost 25 yrs. and does good work for a fair price and stands behind it. To many of these Half-Azzed shops giving others a bad name for there shoddy work.