Hey guys I’m new here and just picked up a 92 fourtrax and there is a knocking noise coming from what looks like to me the universal joint from the rear. The part I can not see it looks to be incased in the motor. I cannot see it with my eyes but I want to take the rear end out as I saw the bearing for the swing arm on the drive shaft side is shot. I took the caps off to remove the swing arem but one side has no bolt or nut and the other side has a huge Allen key bolt with it looks like a locking nut but it won’t move. I don’t have a Allen key that big and was wondering the size of Allen key and how this shaft comes out?