Engine: 4.0L SOHC - 4x4 - Sever buzzing vibration starts at about 2300 RPM and then smooths out at around 4000 RPM. Checked exhaust, removed accessory belt, replaced torque converter and transmission, rebalanced drive shaft, replaced all shocks, rebuilt front suspension, rebuilt rear differential, no cure. Vibration is present whether driving or standing still, in gear or neutral, with accessory belt on or off. It is bad enough to blur all of the mirrors. Any ideas?
Probably not harmonic balancer,but check it for wobbling. The V6 Mustangs had lots of bad crank pulleys replaced.
Hope its NOT main bearings,like was said. don-ohio
SOURCE: Engine vibrates, shakes car at 1700 rpm, smooth at 2000 rpm
Something similar happened to my van, and it ended up being that I needed to replace a tie rod in one of my wheels. Hope this helps! I know this was posted awhile ago.
SOURCE: F150 2003 5.4L Vibration throughout truck with acceleration
When you say "throughout" that would indicate that it is coming from the rear of the truck..
There could be a number things causing this..
It could be a bad tire or a broken belt on a tire..
A test for this is - roll along at 3 miles per hour.. If you feel a wobble - that is probably a broken belt in a tire..
Or maybe even a bent axle..
It could be a bad universal in the drive shaft..
It could be a broken shock/strut or mount or both..
Best of luck !
SOURCE: severe vibration and knocking sound!
My sons explorer had a similar problem. beleive it ior not, it was the shakles, they were severely wroughted, I changed them and the vibration is gone.
Take a look, it may help
Ken
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