Good Day. First post here. I just bought a 2012 Kubota 900 RTV. It had a bad knock in the front end when driving at all speeds. We took off the front propeller shaft and the female splines on the front differential side was worn. Sent it to a machine shop and they resplined it and made sure the shaft was straight. We inspected the CV joints and repacked them and reinstalled the propeller shaft onto the machine. It started out no knock but then it developed same knock from around 7 mph to 15 mph then stops and runs smooth.1mph to 7 mph is smooth also. Any help would be greatly appreciated. Thanks.