Transmission Countershaft
CTPA-1677827M3 Replacement Part to Fit:  Massey Ferguson For Models: (360, 375, 390, 390T, 398, 399 ALL W/12 SPEED SYNCROMESH TRANSMISSION) 17 / 33 Spline, 14 Tooth, 12.250" Long  Price:  $195.23  Buyers Club Price:  $175.71