P. A. Schilke
Well-Known Member
- First Name
- Phil
- Joined
- Apr 3, 2019
- Threads
- 142
- Messages
- 7,016
- Reaction score
- 36,214
- Location
- GV Arizona
- Vehicle(s)
- 2019 Ranger FX4 Lariat 4x4, 2020 Lincoln Nautilus, 2005 Alfa Motorhome
- Occupation
- Engineer Retired
- Vehicle Showcase
- 1
Definitely not start up shudder if you describe it as above 70mph. Helpful to know the frequency of the vibration and your dealer Tech with their NVH equipment should be able to determine. It could be tire ovality which is not balance. Or out of round rim... just guessing until it is possible to pin down the frequency of the vibration and the engine rpm as well as vehicle speed. Also, what does your calibrated assometer indicate where the vibration emanates? Front or rear, Left or right or center?Took this video today. I am sure under load things are much different, but unfortunately a highway video is hard to do with just an iphone. Smooth as silk all the way until you reach interstate speeds above 70mph. Then it is the exact same high speed vibration you feel when driving. I did this to confirm it is NOT unbalanced tires.
best,
Phil Schilke
Ranger Vehicle Engineering
Ford Motor Co. Retred
Sponsored