540 RPM PTO Shaft
CTPA-72222287 Replacement Part to Fit:  Allis-Chalmers For Models: 5670, 5680, 6670, 6680, 6690, 7600, 7650, 8610, 8630 1.750" Shaft Dia., 6 Spline, 4.890" Long  Price:  $100.27  Buyers Club Price:  $90.24