My neighbor has an MTD model 13BR609G022 (Lawn Chief) 17hp/42" cut rider that has developed a jerk in the transmission when it is under a load. Have removed transaxle after eliminating belts and pulleys. Upon removal of the cover on transaxle all I have been able to see is the axle bushing on right side is severely worn. Would this alone cause enough misalignment in the pinion to cause it to hesitate or skip just a bit causing it to jerk as described? The model # on transaxle is 618-0307C.