driveline vibration caused by improper subframe install
06-08-2010, 09:20 AM
#1
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Join Date: Feb 2010
Location: Virginia
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driveline vibration caused by improper subframe install
I was wondering if improperly installed sub frame connectors ( installed wrong by not having the car supported correctly) could have the body of the car of of wack enough to cause a driveline vibration ( vibration when decelerating between 10 to 30 mph both applying the brakes or just coasting)? I had a set of sub frames installed a while back and ever since I have ad a bad vibration in the car when decelerating between 10 to 30 mph. Tires have been balanced, aligned and checked for bulges. I have replaced the u joints on the drive shaft. Any ideas? The car also shakes a bit when accelerating at low speeds from a stop up to about 20 to 30 mph.
06-08-2010, 09:41 AM
#2
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I have never heard of this issue, but I would have to say it may be possible. Do the doors close funky or not align properly?
How was car supported when the SFC's were installed and how do you know it was not done correctly?
Jazzer
How was car supported when the SFC's were installed and how do you know it was not done correctly?
Jazzer
06-08-2010, 10:37 AM
#3
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doors close fine. just thought that could be a possibility since that was the only thing that has been done to the car lately. Any other ideas of why I would get that odd vibration? almost feels like a warped rotor but I just replaced those too about 2 weeks ago and it made no difference in the feel either. I would thought the car was on a lift (not sure if it was chassis supported or one you drive onto).
Last edited by bruthru2003; 06-08-2010 at 10:41 AM.
06-08-2010, 11:06 AM
#5
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The car must be supported by all four tires and level in all directions. There are a couple ways to achieve the same effect while NOT on all four tires, but difficult to describe and get right.
You mentioned replacing the U-joints, have you confirmed that they are installed correctly. Is it possible you damaged the driveshaft in some way or maybe knocked off a weight during your repairs?
Jazzer
You mentioned replacing the U-joints, have you confirmed that they are installed correctly. Is it possible you damaged the driveshaft in some way or maybe knocked off a weight during your repairs?
Jazzer
06-08-2010, 11:26 AM
#7
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Join Date: Feb 2010
Location: Virginia
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looking into the drive shaft. The u joints are definitely installed correct. The vibration started before the u joints were replaced. changing them didn't make any noticeable change. Car seems good at higher speeds, doest feel a little shaky in random instances. Thanks for all the comments by the way!
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