87 bird vibration

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87 bird vibration

August 11, 2006, 04:51:50 PM

I recently acquired an 87 t-bird with the 3.8 that I am really starting to like. One problem I just can't seem to figure is it has a vibration that comes and goes. It almost has the feel of warped rotors but it sometimes comes in when I am just cruising on the freeway. Seems to be centered under the center of the vehicle. Almost always happens when I take my foot off the accelerator. I had the trannie flushed and have tuned the engine which runs very smooth. I wonder if it might be u-joint? Any help?

87 bird vibration

Reply #1 – August 11, 2006, 07:28:13 PM

if it only does it during cerain speeds (like 40-60 mph) i'd balance your wheels, but if the tires arre newit may also be a slaightly egg-shaped tire, like a manufacturer defects. im not excactly sure what it'd be if it only does it when u let off the gas tho.

87 bird vibration

Reply #2 – August 11, 2006, 09:16:25 PM

I'd have to check those U-joints right away (before one breaks at speed). You might wanna check the pinion bearing while you have the U-joint out (just see if the pinion has any up/down slop)

87 bird vibration

Reply #3 – August 12, 2006, 12:47:36 AM

my vote is for the pinion bearing. u joints are also part of it id bet

87 bird vibration

Reply #4 – August 12, 2006, 04:25:04 PM

I'm going to have the u-joints and pinion bearing replaced over the weekend.

87 bird vibration

Reply #5 – August 15, 2006, 10:02:18 AM

U-joints most likely....