02 F150 9.75 posi rear diff in my truck. Problem: clutch "shimmy" during tight turns with acceleration Long history: Lost axle bearing chewed up axle. rebuilt rearend all bearings swapped to 4.56 gears! clean inspect clutch pack...assemble add ford modifier to 75-145w synthetic. ALL IS WELL!!! forward 4 yrs.... lost "replacement axle: (just started to humm) disassemble clean inspect replace both axles YOUKON and axle bearings !!!!!! 75-145 lube + 1 bottle modifier Problem starts: noticed immediately after warm up, test drive that clutches were "tight".... do a few figure 8's to work the clutch lube in (i did put them in WET) drive a week...still "tight" CLUTCH BITE!!! (kick in the ass sideways) ADD A 2ND BOTTLE OF MODIFIER this helped but still get a "shimmy" when taking off/turning ...NOT CLUTCH BITE ...but a shimmy. MY recommended FIX (heres where i need some input) Remove C-clips and grind .002-.003 off each ...re install. (i am a 25+ yr Tool & Die maker...this is not a challenge) Is .002-.003 ENOUGH or should i be a little more aggressive? like -.005 OR add yet another bottle of modifier?