what is the difference between the 6in standard kit and the 6in rockrunner kit?

Pictures would help alot!

thanks

 

The only difference is the control arms. They each come in two pieces. On one end, it looks like a screw and is threaded. The other end is like a hollow pipe and is threaded on the inside. You screw one into the other until you get the right lenth. This allows for two things. More flex of the suspension system because they can twist. Adjustability of the suspension because you can thread in the controls arms to pull the axle back, or thread out the control arms to push the axle forward. Also, you can extend the tops and leave the bottom allowing you to increase castor or whatever else you want to do.