IAmTheDoctor

2010 Fusion AWD just replaced R/H rear shock (what a PITA that is!) question is: On the rear suspension lower shock absorber bolt there is a rectangular rubber bump piece on a steel mount that fits over bolt under the nut. Looks like a bump stop but the suspension would have to be pretty wrecked for it to contact anything. Is that just a weight/vibration damper or does it serve some other purpose?

Turns out is was the drive shaft after all. Front steady bearing was causing the vibration.

Vibration frequency is wrong for tires or wheels, much higher frequency than that. Front brake pads replaced last weekend but double checked, everything there is correct and secure, rotors all look good.

2010 AWD Sport 3.5L Auto, 116,000 KM (@72,500 Mi) - When accelerating hard (eg. up highway on-ramp) I get an intermittent bad vibration when speed passes through about 60Km/H (40 MPH), sounds like a flat tire or like something is caught underneath and slapping against underside.Vibration persists until pulled over, let the car sit for a moment and it doesn't come back until I have a brain fart and try standing on the throttle again.I also have a minor vibration at low speed (below 50Km/H/30MPH) which is significantly reduced after about 15 minutes of driving. Had the car up on a hoist and cannot find any evidence of anything rubbing/contacting the drive gear or underside, shook the crap out of everything I could grab, nothing loose, no leaky CV boots. No evidence of leaking from front or rear gearboxes. All suspension components and front and rear half shafts to wheels look good. Only thing I can find is that the steady bearings for the driveshaft are a bit slack (1/4" to 3/8" movement when pushed/pulled) but I have no reference to tell how slack is too slack. Tires are not new but are evenly worn and pressures are correct. Wheel lug torque checked - all good. Just put on new front brake pads - rotors look like new, inspected rear pads and rotors, all looks good. I've heard that the drive shaft is prone to failure but I was wondering if anyone else had some advice on what I might check before going that route. Thanks in advance.