Rotational whine noise 2005 Z71 Tahoe

[chris.ncfb]

Rear bearing of Transfer Case fits your symptom too. What year is your Tahoe? Have you checked your fluid level in the transfer case lately? Is the tail off the transfer case wet?

I believe this is what the problem is. What is the best way to repair?

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[dantheman]

i havent seen the 4wd trucks, is the rear driveshaft bolted on and the slip yoke in the middle or does it have a slip yoke that goes into the tcase?

if its bolted in id see if taking the rear driveshaft out and putting it in 4hi still makes the noise.

 

[chris.ncfb]

I'm gonna be a dumbass here probably. Can you hear the whine sitting still? If you rev it in park does the whine increase? My stereo makes a whine that the pitch increases as the engine RPMs increase. Just a thought.

It only does it in motion. I had the stereo whine too. I had some kind of filter put in that made it better then I bypassed the bose amp and ran my rear speakers directly through my head unit and it worked like a charm. No more stereo whine.

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[chris.ncfb]

i havent seen the 4wd trucks, is the rear driveshaft bolted on and the slip yoke in the middle or does it have a slip yoke that goes into the tcase?

if its bolted in id see if taking the rear driveshaft out and putting it in 4hi still makes the noise.

I haven't tried that yet. I am draining the transfer case tonight to see if there is anything in the fluid. I believe it goes straight into the tc.

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[rockola1971]

I haven't tried that yet. I am draining the transfer case tonight to see if there is anything in the fluid. I believe it goes straight into the tc.

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You probably wont find any evidence in the fluid. The bearing is a needle bearing and they dont typically shed much metal during failure until they terminally fail and come apart.

 

[chris.ncfb]

I believe this is the one that is giving me trouble. Would this type show up better than the needle bearing in the fluid?

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[rockola1971]

I believe this is the one that is giving me trouble. Would this type show up better than the needle bearing in the fluid?

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Not unless the cage come apart. Those typically make a loud grinding noise when they go bad. The needle bearing is the in the tail section of the rear housing of the transfer case. The only way to change it out is to remove the transfer case and remove the rear half to get to the need bearing. Its marked rear output bearing.
http://i1369.photobucket.com/albums...sfer Case/NP246/NP246CaseHalf_zps1b8c5c35.png