I did a 4.56 gear install on the AAM 11.5 axle about 6 weeks ago. Here are a few pictures of that setup. I also did a 4.56 gear install on the AAM 9.25 axle about 4 weeks ago; however, these pictures are only of the 11.5 install.
I purchased my gears from Just Differentials, and the price of my gears, install kits, and differential fluid for the front and rear axles was about $1200.00.
Factory backlash @ .008
Factory coast side
Factory drive side
4.56 pinion & 3.73 pinion
1st pattern backlash set at .009
1st pattern, drive side, w/.055 pinion shim -- too shallow
1st pattern, coast side, w/.055 pinion shim -- too shallow
2nd pattern backlash set at .008
2nd pattern, drive side, w/.070 pinion shim -- perfect
2nd pattern, coast side, w/.070 pinion shim -- slightly deeper
19 in/lbs Pinion torque to rotate(PTTR)
37 in/lbs Total torque to rotate(TTTR)
Final drive pattern, .070 pinion shim, .008 backlash
Final coast pattern, .070 pinion shim, .008 backlash
Let me know if you need anything else.