I would check the condition of the rear gears for starters.The rear axles will come out easily .The rear cover is taken off and the bolt that holds the pin ,then the pin block and spider gears will come out the axles then just need a push in to get the clip out then the axle will pull out .I have taken the rivets off of those backing plates and taken the backing plates off . I don’t know if bolts are satisfactory to put backing plates back on but the plates do come off .the one I have is sitting in the corner if you need any imfo I can look at it further . I would be concerned about the bushings inside the tube if the tube was leaking oil down to the brakes.
