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A collection of helpful articles based on reader submissions
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  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
If you have any questions, please feel free to email us.
 
 

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  Jim Grant's Tech Tips

'95 Ford Aerostar, Rear End Noise

Q: I am looking at a ‘95 Ford Aerostar extended that has a noise in the rear end that my short wheel base Aerostar doesn’t have. It sounds like snow tires humming (not very loud) and it only occurs during acceleration.

- John

A: About all you should do is look at that vehicle and walk away. Why? The noise you’re describing is that of a failing pinion bearing in the rear end. The concern is how long has the vehicle been driven with this condition? As a bearing fails little metal flakes break way. These flakes become suspended in the fluid that cools and lubricates all the other bearings in the rear end/differential. It is a rare day that one failing bearing doesn’t begin the failure of others or worse yet damage the differential ring and pinion gears. To correctly repair this condition the rear end should be fully disassembled, cleaned and inspected. Sometimes it’s easy to replace just the loud bearing. But if the job is not done correctly you’ll have a chorus of bearings singing their way into your checkbook sometime down the road.

 
     
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