89 GT Help with vibration?

Question

Hey, guys,Hoping someone can identify this problem...  When I'm on the freeway going over 60, if I let off the throttle, the carvibrates really bad (getting worse).  The faster I go, the more violent theshake gets, at 90 MPH it's almost bad enough that I cant find 5th gear.  Theshifter is really rattling around at that point.  The vibration is higherpitched the faster you go.  If I apply the gas in gear, or if there is any loadon the drivetrain, the vibration almost stops completely.Any ideas?Any help greatly appreciated!  Matt

JD Adams · Accepted Answer

** Hoping someone can identify this problem...  I'd bet $100 on the Driveshaft U-joints.  Put that thing on a lift and checkit out now, before it takes a complete dump on you.

Mr. Ford · Answer

Could be a couple of things.Worst case scenario is the rear end is ceasing.Best case is your universal joints are going.

Michael Johnson, PE · Answer

I agree.  The main reason I feel this is the problem is the vibration stops when the shaft is under a load.JD Adams wrote:

2.3Sleeper · Answer

You ever have one of the days JD were you really feel like someone, somewhere is trying to yank yer chain? LOL

I asked this question in here not to long ago....I have the same year Mustang GT, same exact problems...and my wife's brother just happens to be named Matt.

Sometimes....I don't know. Weird is all, just plain weird.

Don Manning

2.3Sleeper · Answer

I can completely agree with JD. I just changed out my front U-Joint and itwas an absolute pleasure to drive once it was done.Don Manning

JD Adams · Answer

** You ever have one of the days JD were you really feel like someone,** somewhere is trying to yank yer chain? LOLI had one of those moments once.  Her name was Valerie.  Her brother was namedJD, and she owned a crappy old Dodge Dart, same as I did at the time.  And shehad hair in all the wrong places, like...uh,...ummm...nevermind.

Matt · Answer

Hmm... Those aren't too expensive, either.  Do you know if they are an easyswap, or will there be problems getting everything back together?  How can Icheck to see if they are bad?Matt

stew · Answer

u joints...check and replace if needed~stew~

89 GT Help with vibration?

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