im sure its with the lowering, i lowered mine, and both split open. of course i have a 91 and you have to replace the whole upper arm. Ive been driving with them for about 3 weeks.. and was thinking I should prolly somehow when I get the new ones clamp the gaskets down more or something on the ball joint. Cuz at 150 per side, it doesnt really make me very happy. Anyone know of anything like that to make them less prone to breaking?