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1992 Comanche Vibration over 40mph


 
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bigshrimpin
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Joined: 26 Feb 2006

PostPosted: Sun Feb 26, 2006 10:21 pm    Post subject: 1992 Comanche Vibration over 40mph Reply with quote

I just bought a 1992 comanache w/ 155K miles, one owner, always garaged, new tires, brakes, etc. When I test drove the car I just took her around the block and always keep it under 35/40mph. Everything seemed real tight.

When I was driving it home today . . . I noticed a bad vibration problem on the highway (actually it starts at 45mph) and only is noticable when you are coasting or decelarating. If you accelerate the vibration nearly goes away. Any ideas ???? it's a 2wd truck. There is zero vibration under 35mph.

I was thinking U joints? b/c that's seems to be where the vibration is coming from . . .
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JeepinNH
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Joined: 13 Sep 2005
Location: New Hampshire

PostPosted: Mon Feb 27, 2006 9:20 am    Post subject: vibration Reply with quote

I would definetly check the u-joints first.
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Mike

Present: 99 Cherokee
Past: 86, 87 Cherokee; 94 Grand Cherokee
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bigshrimpin
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Joined: 26 Feb 2006

PostPosted: Mon Feb 27, 2006 10:11 am    Post subject: Reply with quote

Mike - Thanks for the advice . . . I crawled under the car and tried to rotate the drive shaft by hand to see if the was any slop/play, but there doesn't appear to be any . . . I greased the joints while I was under there.

What is the best way to see if a U-joint is bad or going bad?
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JeepinNH
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Joined: 13 Sep 2005
Location: New Hampshire

PostPosted: Mon Feb 27, 2006 2:53 pm    Post subject: u-joints Reply with quote

Check for side to side and rotational play at each joint. There should be none. The rear ones seem to go first. Usually a bad one will show signs of rust where it pivots also. Really bad ones will clunk going from forward to reverse and back again. Also when driving if you let off the gas and then hit the pedal you may feel a clunk. Good luck.
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Mike

Present: 99 Cherokee
Past: 86, 87 Cherokee; 94 Grand Cherokee
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bigshrimpin
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Joined: 26 Feb 2006

PostPosted: Tue Feb 28, 2006 3:54 pm    Post subject: Reply with quote

I did notice a little clunk when I let off the gas.

I'm going to try to replacing the u-joints myself. Wish me luck . . . I'm pretty green when it comes to this!!!
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bigshrimpin
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Joined: 26 Feb 2006

PostPosted: Sat Mar 04, 2006 3:39 pm    Post subject: Done Reply with quote

I replaced both universal joints today and that solved the problem!!! No more vibration. On the front joint there were no rod bearings left under the caps at all . . . yikes!!.

Thanks JeepinNH!!
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