Hello, I'm new to this forum and to Mustang ownership in general. I signed up here because I've been having a problem with my recently built '89 Mustang and this forum seems to be more active than others. anyway, here's the low-down:
My car has a thumping sound/feeling that feels like it is coming from the driveline or wheels
It is most noticeable at lower speeds, up to about 60mph. I’m not sure if it goes away after that speed or if the thumping just turns into a higher frequency vibration that is much less noticeable.
The thumping is in direct relation to the speed the car is going… so it slows down with deceleration and speeds up with acceleration. It does not happen at idle.
It does not increase when the car is turning and does not get worse under loads or hard acceleration.
The thumping is also present when coasting in neutral, with the clutch disengaged and when rolling with the engine off.
The car shakes when it is driven through the gears on a hoist.
So far… the driveshaft was found to be loosely connected to the rear end (about 6 threads out!!!). This was causing another high speed vibration, but not the lower speed thumping. I’m thinking that the driveshaft may have shaken itself loose due to whatever is causing the thumping …or it could have been two coincidental, but unrelated problems.
The U joints and yoke were replaced and that made the thumping less severe for a day, but then the problem came back after that.
Any help would be greatly appreciated.
My car has a thumping sound/feeling that feels like it is coming from the driveline or wheels
It is most noticeable at lower speeds, up to about 60mph. I’m not sure if it goes away after that speed or if the thumping just turns into a higher frequency vibration that is much less noticeable.
The thumping is in direct relation to the speed the car is going… so it slows down with deceleration and speeds up with acceleration. It does not happen at idle.
It does not increase when the car is turning and does not get worse under loads or hard acceleration.
The thumping is also present when coasting in neutral, with the clutch disengaged and when rolling with the engine off.
The car shakes when it is driven through the gears on a hoist.
So far… the driveshaft was found to be loosely connected to the rear end (about 6 threads out!!!). This was causing another high speed vibration, but not the lower speed thumping. I’m thinking that the driveshaft may have shaken itself loose due to whatever is causing the thumping …or it could have been two coincidental, but unrelated problems.
The U joints and yoke were replaced and that made the thumping less severe for a day, but then the problem came back after that.
Any help would be greatly appreciated.
