8)Ok guys and gals, I have a '74 fj-40 that I put 2" longer than stock shackels on the rear to level it. Since then its developed a rumble, on acceleration, and backing off, and I can only assume it's because of the change in the pinion angle. Does anyone have a formula for the correct angles, as I've researched the files and there dosn't seem to be any answers other than front axel fixes, and those are for caster correction. Please help! And does anyone know where I can get steel shims, I've heard aluminum ones are BADDD. Earl