TerryZak
Junior Member
I purchased a 2010 V6 Mustang for our younger son. Got a deal because I was pretty sure the rear end was shot.
After installing the rear end after we did a full rebuild, I noticed some other mild vibrations. I've replaced both engine motor mounts (were leaking) and the rear transmission mount. I've also had the upper link and bushing replaced.
The remaining issue is that when cruising around town there's a slight vibration at 1,400 rpm. Vibration is present when the car is in park, but only at a very narrow rpm of 1,400 and 2,800 rpm. Since 2,800 is a multiple or harmonic of 1,400 rpm I inspected the harmonic balancer carefully and didn't find any issues.
I've read that some of these had issues with cracks in the flex-plate, so I removed the starter and made an inspection. There wasn't anything obvious. I did find some hair-lines that looked like they could have been a crack, but used a metal seal-pick to scratch across the marks to see if I could "catch" a crack and was not able to.
The care could use the rear main seal replacement, but I don't want to go further on that until I have a better idea if I need replace the transmission or not.
Has anyone out there come across vibration at these rpms? If you vary by more than +/- 20 rpm from 1,400 and 2,800, the vibration will go away. Any ideas?
Thanks in advance,
Terry
After installing the rear end after we did a full rebuild, I noticed some other mild vibrations. I've replaced both engine motor mounts (were leaking) and the rear transmission mount. I've also had the upper link and bushing replaced.
The remaining issue is that when cruising around town there's a slight vibration at 1,400 rpm. Vibration is present when the car is in park, but only at a very narrow rpm of 1,400 and 2,800 rpm. Since 2,800 is a multiple or harmonic of 1,400 rpm I inspected the harmonic balancer carefully and didn't find any issues.
I've read that some of these had issues with cracks in the flex-plate, so I removed the starter and made an inspection. There wasn't anything obvious. I did find some hair-lines that looked like they could have been a crack, but used a metal seal-pick to scratch across the marks to see if I could "catch" a crack and was not able to.
The care could use the rear main seal replacement, but I don't want to go further on that until I have a better idea if I need replace the transmission or not.
Has anyone out there come across vibration at these rpms? If you vary by more than +/- 20 rpm from 1,400 and 2,800, the vibration will go away. Any ideas?
Thanks in advance,
Terry