This problem is on my 2007 Mustang GT, Auto Trans, 102k miles.
This problem is almost always present, but it seems to get much worse without any warning, sometimes it is hardly noticable. Cold weather seems to make it worse.
There is a bumpy/shuddering feel when I go above 35 mph, above 60 it is twice as bad as 35mph. Above 70 is no worse than 60. It feels like someone is hitting the bottom of the car with a rubber mallet. On Super smooth roads it is almost non existant.
No CEL, engine seems to be running perfectly. BUT I recently put the car on ramps and put my hand on the oil pan and it seemed to be vibrating more than what I thought it should. Maybe motor/trans mounts?
Acceleration, constant speed, and decel are about the same, braking does not seem to make it any better or worse.
The tires were my first suspicion but I replaced them in the spring and while it did make the problem much less noticeable, it is still there. Have balanced them at Discount Tire twice.
When going down the road at 75mph I put the car in Neutral, problem was still there.
Replace rear lower control arms since one of them had a bushing that looked really bad. Did not help at all.
Replaced the original rear shocks a couple of weeks ago. Did not help.
Last weekend I looked at the Differential mount and bushing - it looks bad - but I'm not a bushing expert. Maybe this is the problem?
This morning on the way to work as I was getting on the interstate (heavy accelleration) it was as bad as it has ever been. Felt like one of the wheels was going to hop off the car. Came to a stop, made sure one of my tires was not flat, got back in and drove 25 miles to work and the light bumping was still there, but not bad at all.
I am at a loss, maybe it is the differential mount bushing, maybe it is a stuck caliper, maybe it is a transmission shudder. Open to ideas and suggestions.
This problem is almost always present, but it seems to get much worse without any warning, sometimes it is hardly noticable. Cold weather seems to make it worse.
There is a bumpy/shuddering feel when I go above 35 mph, above 60 it is twice as bad as 35mph. Above 70 is no worse than 60. It feels like someone is hitting the bottom of the car with a rubber mallet. On Super smooth roads it is almost non existant.
No CEL, engine seems to be running perfectly. BUT I recently put the car on ramps and put my hand on the oil pan and it seemed to be vibrating more than what I thought it should. Maybe motor/trans mounts?
Acceleration, constant speed, and decel are about the same, braking does not seem to make it any better or worse.
The tires were my first suspicion but I replaced them in the spring and while it did make the problem much less noticeable, it is still there. Have balanced them at Discount Tire twice.
When going down the road at 75mph I put the car in Neutral, problem was still there.
Replace rear lower control arms since one of them had a bushing that looked really bad. Did not help at all.
Replaced the original rear shocks a couple of weeks ago. Did not help.
Last weekend I looked at the Differential mount and bushing - it looks bad - but I'm not a bushing expert. Maybe this is the problem?
This morning on the way to work as I was getting on the interstate (heavy accelleration) it was as bad as it has ever been. Felt like one of the wheels was going to hop off the car. Came to a stop, made sure one of my tires was not flat, got back in and drove 25 miles to work and the light bumping was still there, but not bad at all.
I am at a loss, maybe it is the differential mount bushing, maybe it is a stuck caliper, maybe it is a transmission shudder. Open to ideas and suggestions.