here are some pix of my axle shafts....i recently replaced them with a set of used ones off a 94 blazer...i got a whole rearend from a guy off s10planet for $75 plus the drigve to crystal lake, il. the groove is where the bearing was riding....it's just short of 1/4 in deep on the driver's side and prolly 1/16 on the passenger......kinda cool huh?