yeah it was the nut on the end of the spindle. gm said they had no idea. belltech said they had no idea. they told me ship them back to jegs but i already had one side done and the other disassembled so we did the math and figured out that the threads were close enough to file them down slightly, then use emory paper on them, then use valve grinding compound on them and now all is well. belltech messed up but it was fixable if you know what you are doing.