Got a torsion bar 4WD T100, T 100, T-100, Tacoma etc. toyota? got death wobble shimmy or steering wheel shake? Check all your front end parts, if nothing is turning up bad, pull an upper ball joint. I could not get ANY movement out of them while mounted, but when I pulled one it was as loose as a bell clapper! I did all 4 (11 year old truck) and now it tracks like a train.This is not a big deal job to do in the driveway, you don't have to pull the halfshaft either, you will need a 27 mm wrench to install the new Moog joint as it's castlated nut is larger than the factory one. (1-1/16 is the same size and will work too) other than that make sure the wheel is free hanging and be prepared with a jackstand to support the knuckle. oh yeah, you need to disconnect the shock & swaybar end link to let the lower arm to droop enough to clear the ball joint stem out of the knuckle. And I do recommend replacing upper & lower together, and in consideration of the age of ANY torsion bar toy...