Originally Posted by Jo Gutierrez
cannot go over 2.5mm in shims. if the car still feels to loose in the rear, go to other setup options (i.e. tire compound, droop, etc.)
I've never tried it on my 4, but on my 3, I went as far as 3mm. Obviously, I had to change to a longer screw but it worked good. Swauger's 3 set up for the Texas Biggie had 3.5mm. I wonder if it's easier to just change something else like you're suggesting.