I'm getting a bad vibration I can feel in the floor of the cab when the engine is under load. I replaced the driveline ujoints, the coupler on the engine, the Hydro isolator rubber mounts and I still have a vibration. I also tightened up the suspension scissor joints and it hasn't gone away. have any of you had any issues like this? machine has 1200 engine hrs. on it and i have ran duals on the rear. I also jacked up the rear of the machine and try to wiggle the wheels and everything seems tight. how about rear wheel bearings? Has anyone had anything similar I am stumped!