Question about 1999 Chevrolet Astro

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Rear end noise

I have a 1999 Astro, 1 1/2 years ago the rearend started making bad noise so we took it to a mechanic and he totally rebuilt it for us for $1200. Now the noise is back, does Astro have a problem with rearends?

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You cannot check universal joints with the driveshaft under tension. Trans needs to be in neutral (wheels blocked or on jackstands)
If diff is noisy, check gears by removing cover and checking lube for metal debris, gears for "sharpening" on edges. Generally it is cheaper to replace unit with one from a scrapyard. Any work regarding bearings or gears requires precise depth and lash adjustment or the unit will quickly fail again.
Universal joint failure will cause a "clunk" when engaging reverse or drive and also can cause vibration similar to out of balance tires. Worst case is a rhythmic squeak while going about 10-20mph.

Posted on May 10, 2009

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It may not be and is probably not as bad as your worst fears. First, climb under the vehicle and grab the driveshaft and see if you can rock it back and forth showing sloppy universal joints while in park. The driveshaft connects to the rear differential at what is called the "pinion shaft", replaced the pinion bearing and the pinion seal...

Posted on May 10, 2009

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