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Old 06-17-2009, 01:38 PM
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Transfer case-99 Silverado Z71

Know a pretty good bit about engine - my first attempt at drivetrain not looking so good.

Got an annoying chattering coming from under the truck that is consistent with vehicle speed. Goes away after reaching about 30 mph.

Got under the truck and wiggled the front driveshaft coming out of the transfer case (mounted to the trans) and found where the noise is coming from. Doesn't wiggle much, but makes exact noise i'm hearing while driving.

I say u-joints. My neighbor says it's main bearing for front differential. Don't know what a bad bearing for the front differential sounds like. What do you guys think?

Also, just to get the terminology correct, what are the names for the following components?

1) Front of truck where the driveaxles come out of to turn front tires......... Front transfer case or front differential?

2) Middle of truck mounted to the trans.........Front Transfer case or just transfer case?

3) Rear of truck where drivshaft goes into from trans.........Rear differential or rear transfer case or rear driveaxle?

I know, i'm such a rookie but its confusing when the book says it's a transfer case - friends call it a chunk - and the part store calls it a differential.

Thanks for any help

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Old 06-18-2009, 07:07 PM
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to answer your questions

1 front diff
2 transfer case
3 rear diff
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Old 06-18-2009, 07:44 PM
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When you wiggled the drive shaft did the yoke (where the drive shafts mounts to) move or just the u-joint. If the U-joint is bad the yoke will not move, if the yoke moves the bearring is bad
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Old 06-19-2009, 02:48 AM
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did not notice the yoke move, but the front driveshaft definitely had some play in it.
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Old 06-19-2009, 06:32 PM
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the front driveshaft will have a bit of play in it the closer you go to the transfer case, it has a spline that is coverd by a boot. i havent seen one that dosent have a little bit. you just have to look carefully at your u joints when you shake it to check for movement. as not to misdiagnose. if you want to know for shure.. pull the shaft. move it around check for tight spots and play in the joints then check to see if their is play on your front diff yolk. shouldent be any at all. then check the transfer case front output. i would say maby .003" at the most on that someone correct me if im wrong
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