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Old 11-23-2013, 10:20 PM   #1 (permalink)
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Transfer case vibration noise

So today i was hauling a load of scrap to the yard. Not real heavy, i weighed in at just under 12k. On the way over i noticed a vibration noise coming through the shifter on the transfer case. It continued all day even unloaded. It starts at about 25 mph. It is there when u let off, there when you shift, there when your coasting...always. Unless you are under 25 mph. Any ideas? Transfer case need a rebuild?

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Old 11-23-2013, 11:37 PM   #2 (permalink)
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U joint's or carrier bearing transfer case is usually bullet proof
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Old 11-24-2013, 01:53 AM   #3 (permalink)
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I wonder if its the carrier bearing. Will i feel slop if i reach up there and move it?

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'90-4" exhaust, kdp killed, pacbrake, 60 lb springs
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Old 11-24-2013, 03:47 PM   #4 (permalink)
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Carrier bearing is mounted in rubber, so there will be a bit of movement. It is bad, you should be able to tell pretty easy.

Check the u-joints and make sure the nuts on the yoke are tight.
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Old 11-24-2013, 07:48 PM   #5 (permalink)
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Well being a reg cab, there is no carrier bearing. I didnt realize that until i crawled under it. There is some slop in the driveline, but it doesnt seem to be in the u joints. U can turn it a bit either direction and it sounds like where the gears engage

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'90-4" exhaust, kdp killed, pacbrake, 60 lb springs
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Old 11-25-2013, 01:25 AM   #6 (permalink)
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Could still have a dry u-joint that is stiff. Seen that before. Even if it is only in one bearing cup.

If not obvious, you'll need to pull the driveshaft and turn them by hand.
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Old 11-25-2013, 10:48 AM   #7 (permalink)
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I will crawl under and take a closer look tonight. Throw some grease jn there and be sure its all tight then take it for a spin. Ill check fluid levels in the transfer case as well.

Any chance this could be a transmission bearing of some kind?

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'90-4" exhaust, kdp killed, pacbrake, 60 lb springs
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Old 11-25-2013, 02:47 PM   #8 (permalink)
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Also, I should be specific in that it sounds like a fairly high frequency vibration....the closest comparison I can think of would be maybe like a cell phone vibrating
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'90-4" exhaust, kdp killed, pacbrake, 60 lb springs
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Old 11-25-2013, 03:21 PM   #9 (permalink)
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At that frequency it's almost certainly a driveshaft. Does it make a difference if the front hubs are locked or unlocked? That can narrow it down to front or rear shaft.
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Old 11-25-2013, 04:45 PM   #10 (permalink)
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It may sound stupid but when in vibration starts reach over and sort of jiggle the t case lever and see if it stops. My truck has a rattle or vibration noise from that area and its just the t case linkage vibrating.
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Old 11-25-2013, 05:21 PM   #11 (permalink)
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It is all in 2wd without the hubs in.

I have tried the jiggle the handle trick. There is another rattle that that fixes, but this one is a new noise, and jiggle the handle trick didn't work.
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'90-4" exhaust, kdp killed, pacbrake, 60 lb springs
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Old 11-26-2013, 09:44 AM   #12 (permalink)
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mine does it and its just slop in the linkage makign it vibrate
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