Thanks Guys! Using 10.9 upgrade bolts with new nylon lock nuts, and the one no- hex original bolt. I noticed my driver side 2 new bolts had come loose after recent inspection and not sure why. I did a complete rebuilt last year and know I torqued them to at least 40 and the passenger side was ok. That's why I asked about the blue lock-tite as well. I don't think it can hurt.