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Simplicity Sovereign 18

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I am only aware of 2 shaft size/type on the large frame tractors, the 3/4" for early no clutch 2 belt pto tractors and the 7/8" cone clutch bgb tractors. Currently I'm running the bgb from a 3416H, the cone/pulley assembly from a AC716 6 speed and a 912 AC clutch drum on my 16hp Briggs start/gen powered 912AC Hydro with the 3416H trans drive pulley. Rule of thumb cone clutch to cone clutch bgb parts interchange as far as I've seen.

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It will fit fine. In '77 they changed the threaded portion to a 3/4" from the step down shaft at the cone clutch. This was done strictly for torque purposes of the nut holding the clutch. All the internals and overall dimensions of the shaft are the same.

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