Look at this picture of a complete set I just sold on Ebay it had 4 factory shims on the shackles for the truck, 2 left cab, 2 right frame it also mentions them in the assembly manual. My own 3600 had two one on the left under cab, one on the right under the frame. I have parted nine AD trucks this year and where there were shackles they all had at least one shim in them.

http://community.webshots.com/photo/2379203940102454676qNTFMD

Last edited by Brad Allen; 08/04/2009 2:51 PM.