Marcus is great. He is always available to answer any questions and doesn't bs you into buying things you don't need.
I'm in the City and by me is Thom's Four Wheel Drive. They quoted me $800 per axle to install my gears and air locker (I already had the parts). Ended up installing myself. They did torque all my lift jam nuts. Prices are quite reasonable. My only complaint was they did an alignment but couldn't provide me an alignment sheet.
I've known a few that went to attitude and have had good results. They seem to be a go to for more complicated projects. I spoke to them about beefing up my dana 30 and they seemed to know their stuff.
2014 JKU Freedom Edition Hydro Blue
MC 3.5" Lift
37" Milestar Patagonia Tires
ATX Ravine 17x9 Rims
Barricade (SRC) Roof Rack
Barricade Front Bumper
Smittybilt XRC 12000 Lb Winch
D44 Yukon Zip Locker - 4.56
ARB Locked ProRock44 Front w/ 35 Spline Shafts
LOD Rock Rails
MC Overline Fender Flares
CAD adjustable F/R bump stops