I noticed that when I switch from AUTO to 4H, between 40- 60 kmh there is excessive vibration and noise . If I drive in AUTO or 2W drive I do not get any vibratiom. All U joints have been replaced, tires are one year old. tRUCK HAS 132000 KMH on it. What else can be done to get this vibration noise to go away in 4 H?