Check the rubber gaiter on the front propshaft’s sliding joint for splits, and conform the security of the holding clips. The slide joint can be tested by unbolting the shaft from the IRD flange and, keeping the front end supported, feeling for rotational play and roughness I the fore and aft movement in the joint.
Propshaft universal joints can be checked throughout their movement for looseness or tight spots, any of which can cause vibration. Also check the CV joint, but always support the prop to avoid steering the VCU support bearings. Before disconnecting propshafts, mark the flange so they can be reassembled to the same positions.
Keep a check o the forward propshaft rubber gaiter and the securing clip. If water gets in, joint will corrode and vibrate. Propshaft balance plates have been known to come off when badly rusted and or snagged off road, causing vibration, rear propshaft flange will touch and mark panel above if forward diff mount fails. Push shaft by hand to check movement.
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