lol i can run it the way it is but every once in a while ill here a cluncking comming from down under and i hear it puts a lot of stress on ur tranny so i stopped and how do u shim the axles??
With shims:
http://4crawler.com/4x4/ForSale/Shims.shtml 
They go between the axle perches and springs.
Also, you could try shorter shackles (if you're running longer ones) and a drop spring hanger. The spring hanger involves some fab work, but it's not bad.
