I have a Machine Ranger 4 Model 1994 and I have a problem with it, I make up the whole body when I go to more than 60 km I already have an alignment and balancing I already checked my tires and they do not bring any blast
Look at the transmission, you may have something dejusted, or some worn carding that gives more movement the transmission, then you pass from 60 km the set and egual does not do the same thing to you