I've run the Jrs for a few years now and like them alot. They have two settings on them that allow you to control the hit to the tires. I also really like their mounting brackets at the axle. The design really helps prevent axle rotation and puts an end to the tire hop of the factory design. With the Jrs, you can ditch the quad shock...they're no longer needed. I've got a writeup on my website showing their installation.
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Jeff Chambers
T/S #3
11.462 Seconds/117.43 MPH
Chambers Racing Team