make sure to use a wire brush to clean the dirt and crap out of the threads on the flywheel, then use alittle wd40 on them before you thread the puller in, hold the flywheel and turn the puller in till it bottoms out, if you dont get the puller bottomed out you have a good chance of stripping the threads, thighten the center bolt down with a couple quick wraps with an impact gun, then take a hammer and smack the center bolt a time or two, then you should be able to run it off with the impact.