Question about 2000 Chevrolet Silverado 1500

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2000 Silverado 1500 4x4 knocking under the cab when turning or driving over bumps

I just replaced the automatic transmission and now when I drive on bumpy roads something is knocking below the cab. I'm assuming something isn't tight enough or mounted entirely. It seems pretty clear that something is moving around too freely. The truck never made this noise before swapping the transmission. I'm not sure exactly where its coming from except below the cab because I have to be driving it to notice it. Not positive whether it is the the transfer case or the drive shaft and seeking to learn where the knocking is coming from and how to fix it.

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  • 95 Answers

Did ya look into the trans mount or trans mount bracket

Posted on Dec 05, 2012

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Posted on Jan 02, 2017

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SOURCE: transfer case clunk 2000 chevy silverado 1500 4x4

One thing to check, which is often the culprit in these situations is the U-joints. With the truck off, crawl under the vehicle and grab hold of the shaft leading into as well as the shaft going out of your transfer case, If htere is a lot of "slop in it, chance are it is in need of repair. Also I would check the oil level in the transfer case, in an attempt not to challenge you intelligence, there should be a plug located in the lower part about 2 inches from the bottom or so. it usually has a square hole that a 1/2" ratchet fits into. Pull the plug, and stick your pinky into the hole, you should be able to feel the lubricant just below the hole, if not it is in dire need of a filling. also check for metallic remnants in the fluid. this is a sign that things are not as they should be. In that case contact a repairman for a more thorough look.

Posted on Jul 13, 2009

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SOURCE: 99 Silverado 4-wheel drive not engaging

It does not seem that sufficient diagnosis was done. No, you cant give a specific diagnosis like that without tearing unit down. It's likely that they told you the most common failure and left it at that. Likely there is a problem with your unit...I think this becomes more of a trust issue than a mechanical one. A second opinion from an independent reputable shop may help but either way, you need to have it fixed. In not using it much, it makes me wonder how it got worn.
good luck

Posted on Mar 19, 2009

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SOURCE: Loud clunking noise in front end over bumps

THIS IS THE REAR CONTROL ARM BUSHINGS THE BANGING IS THE CONTROL ARM HITTING THE K FRAME

Posted on Mar 24, 2009

  • 1348 Answers

SOURCE: transfer case noise

your u joints are gone.it is common on gm trucks,as they are a sealed unit and the needle bearings rust .there are replacement u joints available that have grease nipples on them. there should be very little play,less than 1/8 inch.

Posted on Jul 14, 2009

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SOURCE: front drive shaft/transfer case removal 03 chevy trailblazer 4wd

Sounds like you got it. They are heavy and ocward (spelling?). As for the front drive shaft take the bolts out and give it a couple of wacks with a dead blow hammer then slide it out. Maybe a few days before hand give it a good spray down with wd40 or like product. Also when you get to the last bolt for the t-case to trans loosen it half way then put a drain bucket under it and seperate it a little and let the trans fluid drain some, or you will be wearing it.

Posted on Dec 23, 2009

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Hi,
Does the bumping sound only happen when you hit a pothole or rough road conditions?Also if the struts are needing to be replaced then the knocking sound will more then likely be the struts.But if it happens when your transmission is changing gears up or down then this will be a band control problem within the transmission.
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