1999 Chevy Silverado Transfer Case/Transmission? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-15-2002, 11:55 AM
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Unhappy 1999 Chevy Silverado Transfer Case/Transmission?

I have a 1999 Chevy Silverado ~ 5300 V8, Auto Transmisson, 4x4. I noticed that I have a noise coming from under me or back by the tires. It sounds like I have a big tire problem, but I rotated the tires and nothing changed. I jacked up the back end and it doesn't sound the same out side standing by the truck, but it still seems there! Somebody said maybe a bearing. Everybody has there own opinion. I'm not sure what to do or what could be the cause or how much it will take to fix is my big question. The truck shifts find and runs good, but the noise. I also notice the noise when I use the 4wd, on dry, wet, or ice/snow. It has a loud hummmmm to it when i get to 25-50 then it goes away, but now this noise under me or in the back is there after I get above 12mph. Please Help someone. <img src="confused.gif" border="0">

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Old 12-15-2002, 02:00 PM
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Easiest thing to do is put it on a rack (or jack the whole truck up and put on stands...start her up...climb under and with a listening device (long screwdriver or extension put to bone at ear) listen to both axle bearings and the rear for pinion/carrier bearings. If you isloate it to one axle bearing, reach up and pull the opposite brake cable to narrow the noise down.

Check the lubricant level and any sign of seal leaks while under there. Shake the u-joints and center carrier bearing while under there (engine off). Have somebody slowly run the engine up and see if there is a vibration noise such as a loose heat shield.

Just be careful with engine running as that shaft will reach down and grab you... <img src="graemlins/pain.gif" border="0" alt="[pain]" />
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Old 12-15-2002, 05:56 PM
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that is good sound advice, keep an eye on your transfer case, had 5 gm trucks at the shop i work for last week, all transfercase, 3 are shift forks that destroyed them selves.
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