front wheel base stretch?
 

I want to get a little better approach angle up front with my XJ. I'm looking to go with radius long arms, ie a clayton kit. My question is can i use them to push the axle forward and if so how far can i move it on the stock coil and shock mounts.

yes if the arms will adjust. the most you'll be able to get is 4" any more and you run into steering issues.

i've moved my box and everything forward and all i could get was 5.5" alot of work for an extra 1.5"

thats good to know I'd like to set the wheel base at 103"