Anybody had trouble stripping out bolts on a Yukon ring and pinion? Went to install a set and the bolts went in hard and stripped out on me. Tried the other ring gear and the same thing happened. Bare ring gears (one high pinion one low), no carrier, bolts started and tightened by hand. Threads look ok. Bolts measure out to be M11x1.0. What am I missing here?