I'd recommend the 4600's as well. Make sure that the jounce stops in the front are in good shape. Actually just replace them, they likely are worn out.
Also in the rear you will want to replace the springs, as the springs are likely worn for one, and additionally are much softer in the airride equipped vehicles since the air shock helps support the vehicle. 81071 is the standard height/duty spring. 81069 is the HD/z71 spring that will leave you with a higher rear ride height 1-2"
Here are the two options:
MOOG Part # 81071 Constant Rate Spring
Bar Size (In): 0.640 Inch
Free Height (In): 16.042 Inch
Install Height (In): 5.266 Inch
MOOG Part # 81069 Constant Rate Spring
Bar Size (In): 0.640 Inch
Free Height (In): 17.177 Inch
Install Height (In): 5.266 Inch