Question about 1994 Ford Mustang

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VIBRATION I have a 1994 Mustang automatic and when I am at about 30 mph (like when it changes gears) it vibrates real bad from underneath (like the transmission) and also at about 39 mph and 45 mph. Once I get pass that is runs smooth. It sounds like the gears to me. What do you think?

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You might include it in the list of items rwc mentioned to check but if you don't think of it, it could also be worn drive-shaft U-joints. Turning the drive-shaft by hand while watching the U-joints from under the car will reveal them if defective.

Posted on Jun 19, 2009

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Sounds like either an out of balance drive shaft or suspension components are shot. Thoroughly check each bushing, ball joint and tie-rod end to make sure they are not worn. Also make sure it's not an out of balance tire or bad tire and that your air pressure in each tire is the same. Good luck

Posted on Jun 19, 2009

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There is a Ford service bulletin that you need to use synthetic transmission fluid to stop this.

Posted on May 26, 2010

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I had similar problem. Changed U-joints and rebalanced drive shaft, still same problem.
Then I changed transmission oil, filter (even oil was looking "good", wasn't smelly and dark brown)
also drained converter. Now it's working perfectly, no low speed shaking at all

Posted on Jul 19, 2009

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I ran through all this and mine is from a stuttering transmission, it only does it before the change from a lower gear to a higher one. I am currently seeking a rebuild.

Posted on Jul 19, 2009

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