Driveline ford edge issues

[schuyler]

2008 Ford Edge 160k AWD. Carrier bearings have just been replaced.

I am getting shaking pretty much every time it's accelerating at ~40mph and 2500 rpms. The problem gets better after the bearings are replaced, but it has never gone away completely, so the problem must be greater than a bad carrier bearing. Where the driveshaft goes into where the drivehaft mounts to the PTU looks off-center (where the camera is pointed), and I am wondering if it's an engine or transmission mount. I think this becasue when I pry on the PTU, the whole engine/trans has a lot of movement. It doesn't seem related because it's the drive shaft that's bouncing, but I figured it could be causing a driveshaft angle to be off. 

 

 

 

[enigma-2]

Have you checked the cars CV joints? Worn inner CV joints can cause a shudder during acceleration. If the shudder disappears when you take your foot off the gas pedal and let the car coast at 40 mph, check the joints.

 

The second thing I'd check is the AWD driveshaft center support bearing. Your 2008 AWD has a two-section driveshaft running to the rear wheels. The two sections connect through  a bearing at the center of the two. At 160k miles, its possible that the rubber dampener around the center bearing has worn which causes the shaft to wobble at the specific speed you mentioned. You can check this by shaking the driveshafts near the middle bearing. There should be no play. Any play at all is wear.

 

Anotheg possibly as reported in the 150 forum that they traced this to the torque converter clutch. You can test this by accelerating to ~40 mph and when experiencing the shake near a shift point, lightly tap the brake pedal with your left foot while keeping your right foot on the gas. If the shaking stops instantly, the torque converter clutch is probably slipping.

 

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Edited 8 hours ago by enigma-2

[1004ron]