Shudder/Vibration while driving
Need some help diagnosing. This has happened twice now, while towing a boat (not overloaded or a heaving boat).
Scenario #1 cruising a road at 55 mph in 4th gear (4 speed auto). Cruise control goes to accelarate and all of a sudden a high speed shudder/vibration is felt throughout the entire vehicle.
Scenario #2 on the interstate driving 75 mph go to accelarate to compensate for a hill and the same high speed shudder/vibratio nis felt throughout the entire vehicle.
It is NOT alighnement or wheel balancing issue. Each time I pulled over, stopped the engine, got out checked everything with nothing found. Got back in restarted and finished my trip with no issues.
I am stearing towards, drive shaft out of balance, u-joint about to fail, transmission sticking or engine bearing.
What are your thoughts?
2008 Jeep Grand Cherokee Loredo 3.7L