Being a bit absent minded at times, in the course of my 3550 to AX15 swap, I replaced the flywheel and clutch. After hours of trying to get the AX15 shaft to find the pilot bearing (success finally)... I realized forgot to use thread lock on the pressure plate bolts. I had them torqued correctly... but.... Anyway, I think I know what everyone will say, but do I need to go back and add the threadlock?
