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Username Post: Intermittent grinding noise        (Topic#133698)
DarylH 
Member
Posts: 6

Reg: 06-12-06
06-12-06 04:21 AM - Post#951440    

My wife's '96 Tahoe has a metal on metal grinding noise, like when your brake pads are gone. The challenging part is that it is intermittent, happening most often when first driving - lasting for a few seconds and goes away after a few minutes or so. It only occurs while moving and is most prevalent at around 30 mph.

I'm at my wits end trying to track this down, as it only happens away from the shop and by the time I get back, it has stopped doing it.

Please, does anyone have any suggestions??

 
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Phazer 
Valued Contributor
Posts: 3004
Phazer
Loc: Armpit of the Universe
Reg: 10-10-03
Re: Intermittent grinding noise
06-12-06 06:05 AM - Post#951441    
    In response to DarylH

Rotrs/drums rusting up, and then gets buffed off from the pads/shoes maybe?
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DarylH 
Member
Posts: 6

Reg: 06-12-06
Re: Intermittent grinding noise
06-12-06 06:14 AM - Post#951442    
    In response to Phazer

Thanks for the reply Phazer.

All the brake components are in good shape, new brake pads and shoes and no apparent areas being scraped or rubbed around any of the moving components of the wheels.

Can anyone here tell me if there's components in the transmission/transfer case that are capable of this type of issue? With both windows down, it sounds like it is coming from the middle of the car rather than being more up front.

 
98Burb4x4 
Senior Member
Posts: 329

Loc: Southern California
Reg: 01-24-02
Re: Intermittent grinding noise
06-12-06 07:11 AM - Post#951443    
    In response to DarylH

Check ASAP your transfer case fluid level. If run very low, it can eat internal bearings. If found low, could be leaking front or rear seal. Grinding noise from transfer case not good.

 
DarylH 
Member
Posts: 6

Reg: 06-12-06
Re: Intermittent grinding noise
06-12-06 07:20 AM - Post#951444    
    In response to 98Burb4x4

Quote:

Check ASAP your transfer case fluid level. If run very low, it can eat internal bearings. If found low, could be leaking front or rear seal. Grinding noise from transfer case not good.




Will do. Would you suggest draining to check for metal while I'm there?

 
98Burb4x4 
Senior Member
Posts: 329

Loc: Southern California
Reg: 01-24-02
Re: Intermittent grinding noise
06-12-06 09:50 AM - Post#951445    
    In response to DarylH

Wouldn't be a bad idea. My '98 K1500 Suburban takes about 3 quarts of Autotrac fluid if I remember right. Alot of others take Dextron III.

 
DarylH 
Member
Posts: 6

Reg: 06-12-06
UPDATE: Intermittent grinding noise
06-12-06 03:42 PM - Post#951446    
    In response to 98Burb4x4

98Burb4x4 - Right on the money. Not only was it low, it was all but dry . Apparently, the rear seal needs to be replaced.

Now for the bigger question, how difficult is it to rebuild the transfer case or should I just replace it? Will it be related to bearings or is there a chain involved?

I believe that it is a NP243, there's a round tag on the back that has 243C stamped in it.

Thanks for the help.

 
98Burb4x4 
Senior Member
Posts: 329

Loc: Southern California
Reg: 01-24-02
Re: UPDATE: Intermittent grinding noise
06-15-06 09:12 AM - Post#951447    
    In response to DarylH

I rebuilt mine myself. Slight pain to get unit out of truck but not bad. I had access to online manual called AllData or something like that or use GM service maunual. My transfer case is the NP246 with chain. The factory teardown and assembly method is pretty intense when it comes to the clutch disc setup. After talking to local expert, he told me he had never needed to change those so just keep those clean and assemble the way they are. So basically don't mess with those if they don't need it. The rest of the parts assemblies are pretty straight forward. You will use snapring pliers, brass punch and other hand tools. It sucks because you won't know exactly what parts you will need until you teardown case. My chain was good. I needed some bearings and a part called the planetary. 4XHeaven.com has a complete rebuild kit that has quality bearings and seals. I went through Scoggin-Dickey to get that factory planetary. Good luck.

 
DarylH 
Member
Posts: 6

Reg: 06-12-06
Re: UPDATE: Intermittent grinding noise
06-15-06 09:25 AM - Post#951448    
    In response to 98Burb4x4

Thanks 98Burb!

You've been a very valuable source of information.

I filled it the night before last, drove it about 2 miles and parked it. No noise and about a 5" puddle under the rear yoke after it sat. I'm going to drain it tonight and see if I get any chunks.

 
98Burb4x4 
Senior Member
Posts: 329

Loc: Southern California
Reg: 01-24-02
Re: UPDATE: Intermittent grinding noise
06-16-06 06:33 AM - Post#951449    
    In response to DarylH

That's good news about no noise after oil fill. Yeah if it's rear seal, not bad at all to replace, just drop driveshaft and go at it. Glad to help. I know I've learned things from others here.

 
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