I talked to Gregg. There are about 40,000 easy miles on it. The shafts are for an automatic JK. He says there is about a half-inch difference between an automatic and a manual but the shafts have about 6 inches of splines.
Thanks for putting up this info.
I want to clarify a couple of points.
The Transfer case was not used for ANY offroad driving until I acquired the JK from the handicapped gentleman I sold it to as a New JK from my dealership. I bought it with around 26,000-27,000 miles and have used it offroad since then.
According to my parts department, the STOCK drive shafts on a 2dr JK are about .5 in difference from Auto to Manual transmission.
I don't know if there is any difference in the Coast 1310 drive shafts for an Auto or Manual, given they have 6inches of spline slip, I would think they work as long as the yokes are compatible with your set up.
I always provide information as accurately as possible, but as always DO YOUR OWN RESEARCH to make sure your set up is compatible.