i bought new youkon 31 spline axles. they came with a thicker or wider coller than stock and the axle wont go all the way in it seem like the coller is hitting the seal in the axle tube. is there a different seal i can get? the axle wont even turn when i start to tighten it down. the only other thing i can think of is that i have the wrong length axle in the wrong side but i think there is more of a difference in length than that.