Transfer Case Grinding Noise
Posted 23 May 2010 - 07:56 AM
In the first video, you can really hear it start as soon as I put it in gear (@ 5sec), and then I rev up the engine and let off and can really hear it (@ 30sec) - this is how it sounds running down the highway about 50-60mph. I put it into 4WD (@ 1min) just to verify it's not just doing it in 2WD and it's doing it in 4WD as well. Later in the vid I switch it to Auto4WD (about 1:45) and it's doing it there too.
Another angle, I could also feel it by touching the case (@ 25sec) that it was indeed from the transfer case so my ears were not deceiving me.
I checked the fluid level it and it is just below the fill hole, so the noise is not from lack of fluid. What could it possibly be, loose chain, or...?
I have a service appt tomorrow morning to have it checked over, but didn't know if anyone would have a better idea what the problem is inside that I can tell the service technician so they aren't spending all day hunting for the answer.
Posted 23 May 2010 - 10:37 AM
I'm here all week ,try the Veal !!
Posted 27 May 2010 - 03:24 PM
Rear bearing came apart, chewed up the pump, the reluctor wheel rubbed on the speed sensor, and rear bushing was worn. Completely overhauled T-case with parts listed below and she's good as new.
Here's everything they replaced:
Pump Clip (thanks to Draenor for sending that to me, I called my service tech to see if they'd replace the clip with the new P/N and he said he did - they keep that part # handy, they said they're seeing a lot of "pin-hole" problems lately because of that clip)
Good thing for GM's Powertrain Warranty!
Edited by stadt11, 27 May 2010 - 03:25 PM.
Posted 06 June 2010 - 08:09 PM
Posted 07 June 2010 - 02:12 AM
these t cases are very easy and a good driveline guy can have it out and apart in no time (which has nothing to do with what you'll pay) and they will see something,dont worry,do you know jro?
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Posted 07 June 2010 - 05:28 PM
I'm here all week ,try the Veal !!
Posted 07 June 2010 - 09:11 PM
What a useful thread !!!!!
Here's my scenario.......
My transfer case is leaking pretty bad and took a look and thought my case was cracked.
I then noticed a couple of pin holes on the case.
There is a humming noise comming from somewhere as well and pretty sure it the transfer case.
Is this common for this transfer case? Would i have to rebuild as well? or is it cheaper to buy used again?
Thanks again. 99 silverado-5.3L 4x4
Posted 08 June 2010 - 08:45 AM
Current TSB for this can be found at this link ... http://ww2.justanswe...r_case_hole.pdf
Found a post on another site saying the "hole is 1/2 way up the backside of the case right above the tailshaft".
Why does this happen? Basically the magnesium alloy is too soft when heated - http://www.sonnax.co...C-TIP-11-07.pdf
Found that Sonnax has designed a new Pump Plate - http://www.sonnax.co.../100246-02K.pdf
Posted 08 June 2010 - 04:16 PM
Posted 08 June 2010 - 06:54 PM
That must be it but is that all you think that might need replacing(clip) or will there be visual confirmation that a bearing or pump needs to be replaced?(i know its hard to say with out seeing it). So this clip is out of place and is casuing the pump to be out of positon?And this is causeing the noise? Or is to late and now the bearing is gone too? Thank you.
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