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Looks like a M939 transmission PTO? G.

Well, the resulting TORQUE of your bodyweight X 5' should remain the same, with - or W/O extension (not considering inertia from jumping on the pipe's end). Of course, the real IMPACT effect (ANY impact tool) is only possible without extension; that is, no cushioning "torsion bar" in between...

Wanna see my super-low-cost/ high-efficiency "single hammer" impact wrench? :smile: A 7 pound sledge hammer hitting the end of a 2 ft long, 1-3/4" x 5/8" bar, with a 1/2"-> 3/4" adapter socket welded to the other end... This improvised and very simple "redneck"-style tool has seen service...