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unless i missed somthing, shims on a 34 box are on the top cover. the bottom is only the cover and light switch. fitting the shim stack is normally done on the bench, in a vise, without the sector shaft in place so you can feel the drag of only the worm and its bearings. to do this in the truck i suppose would be possible, but certainly not how its normally done. i suspect if its getting tight, and been that way for some time, you are going to find it needs more than just adjustment of the worm bearings