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  #11  
Old 06-02-2012, 02:38 PM
mod5csi mod5csi is offline
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Appears to be stock height. I bought it with 33" tires and steel 16" wheels already on it. No other mods a far as I can tell.

I got under it with all 4 wheels spinning in the air. I verified it is coming from the front diff. The noise peaks at 30 mph and tapers off after that. But it is always there to some degree. Verified with a stethoscope.

The pinion nut has it's lock ring, so im not going to mess with that until I get a new one to install. I tried wiggling the flange up, down, left, right, and in and out and there is no excess movement. There is about 25 of play when spinning the pinion before it meets resistance.

For now I have removed the DS again. And will start shopping a rebuilt front diff, or parts to DIY.
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  #12  
Old 06-02-2012, 04:26 PM
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sounds like a bearing or possibly ring and pinion... Is this an elocked truck? Slee rebuilt mine for a decent price, but reused the ring and pinion. this happened in July last summer and it's been fine since, even with the V8 motor.
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  #13  
Old 06-02-2012, 04:29 PM
mod5csi mod5csi is offline
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Not e-locked.

Im pretty sure I'm going to commit myself to rebuilding it. If anyone has a spare let me know.
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  #14  
Old 06-03-2012, 06:38 PM
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TIMZTOY TIMZTOY is offline
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when you lifted it up to listen with a stetascope. did you check the t-case out put bearings ?
reasion i ask is im confused.
you stated that you pulled the front drive shaft and locked the cender diff..
and the noise went away..
did you do them at the same time ? if so, locking the center diff wont matter with the shaft off..
tip: when stethascope and car lifed.. prob all the bearing points. of the diff..
pinion, both outer axle bearings.. and diffrent spots around the pumpkin.. youll hear the noise everywere. but should be obvious when you find the source..
youll even hear a t-case bearing at the axle's, but wont be obviouslly loud and detailed
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  #15  
Old 06-04-2012, 07:35 AM
mod5csi mod5csi is offline
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Im not sure I follow what youre asking.

With the DS in and CDL locked and not locked there was no noise at the T-Case, and the noise was all over the front diff. Listening through the housing I could not pinpoint, the noise at the pinion, left or right side.

With the DS out I do not hear any noise, inside the car, outside the car, or under the car.

I need to review my differential workings but now I am wondering... What is not spinning with the DS out? Seems to me if the truck is rolling and the birfs are installed everything is spinning as if the DS were in. But I do not hear the noise. So the noise must have been resonating through the DS, and is likely still there, I just cant hear it. Which means I am still causing wear and damage to whatever component it is.
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  #16  
Old 06-04-2012, 08:22 AM
rockrod rockrod is offline
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This leads me to think you have a ring and pinion problem. With the shaft in the gears are loaded which results in the noise. With the shaft out the gears are not loaded so the noise is reduced to the point that you can't hear it. A bearing would make the noise regardless.
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  #17  
Old 06-04-2012, 08:49 AM
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Quote:
Originally Posted by rockrod View Post
This leads me to think you have a ring and pinion problem. With the shaft in the gears are loaded which results in the noise. With the shaft out the gears are not loaded so the noise is reduced to the point that you can't hear it. A bearing would make the noise regardless.
Agree with that theory. You're also using the other sides of those gears with the DS off, since your load is now coming from the axles, rather than from the pinion. IOW, your pinion is the last to get it, rather than the first.
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  #18  
Old 06-04-2012, 08:53 AM
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Quote:
Originally Posted by rockrod View Post
This leads me to think you have a ring and pinion problem. With the shaft in the gears are loaded which results in the noise. With the shaft out the gears are not loaded so the noise is reduced to the point that you can't hear it. A bearing would make the noise regardless.
It's probably one of the side carrier bearings. Usually if the R&P is bad the noise will not go away with speed. A side bearing will make the growling noise you describe, and having the DS out will unload the side thrust against that bearing.
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  #19  
Old 06-04-2012, 09:08 AM
mod5csi mod5csi is offline
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Thanks again guys.

I am inclined to pull the diff now. I will check back in when I get it out. Maybe it will be something obvious once I get it out.

Im hoping to find a shoe lace untied, or something equally mundane
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  #20  
Old 06-05-2012, 08:35 AM
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Quote:
Originally Posted by mod5csi View Post
Thanks again guys.

I am inclined to pull the diff now. I will check back in when I get it out. Maybe it will be something obvious once I get it out.

Im hoping to find a shoe lace untied, or something equally mundane
If you pull it out you should rebuild it no matter what you find. Buying the required bearings & seals is relatively low cost. Find someone in the club with a bearing press and the experience to help you and it's a straight forward Saturday afternoon type of job.
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