Yep, bar against frame to loosen the nut, and vicegrips on the edge of the flexplate to hold things in place when putting the bolt back on. I wouldn't trust anything but a good torque wrench when torquing the bolt. A strong enough impact might be too strong and take out the threads. Although my old Pontiac mechanic friend (RIP) would have definitely used his impact and I'd bet he'd be within a few pounds of perfect. The rest of us mortals are safer using a torque wrench.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 Catalina Safari Wagon.
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