Flywheel Ring Gear
CTPA-70233196 Replacement Part to Fit:  Allis-Chalmers For Models: D10 Tractor SN 3501>, D12 Tractor SN 3001>, D14 Eng SN 19070>, D15 116 TEETH, 11.12" OD, 10.86" ID  Price:  $61.17  Buyers Club Price:  $55.05