High Pitched Whine (Not Rear End) - Page 6

CadiBlk · #76 (**permalink**) 03-03-09, 01:48 PM

This the drive shaft carrier bearing?

Just to add to the trail of information: Here is another thread discussing people with the same issue and a driveshaft replace fixed them.

http://www.cadillacforums.com/forums...ng-squeal.html

I had high hopes when Trukk said that it could be lubed. But then someone said that it just comes back. I am taking my car back to the dealer tomorrow.

This forum is going to allow me to get this fixed in as few of trips as possible. Thanks for all your help guys.

V8V · #77 (**permalink**) 03-03-09, 08:44 PM

One more dead end path to not go down. On one of my trips in, the dealer 'resequenced' the drive shaft. When they replaced the diff the first time, they didn't re-align the drive shaft paint marks to the diff paint marks. They must spin balance the parts at the factory to minimize vibration. No help though. I don't think that there's any visual indication of the bearing going bad.

ewill3rd · #78 (**permalink**) 03-04-09, 02:33 PM

The carrier bearing is not serviceable. You have to replace the entire propshaft.
The front and rear couplers are replaceable.

It isn't necessary to "phase" the propshaft with the yokes, although it can help. You get vibration issues, not noises, and only in rare cases.

CadiBlk · #79 (**permalink**) 03-04-09, 03:06 PM

Car is back at the dealer today. They are going to replace the driveshaft. Thanks to all that helped. I will post my results.

mikemc · #80 (**permalink**) 03-04-09, 04:31 PM

Quote:

Originally Posted by ewill3rd

The carrier bearing is not serviceable. You have to replace the entire propshaft.
The front and rear couplers are replaceable.

There are specific instructions in the factory service manual called "Propeller Shaft Center Support Bearing Overhaul". It clearly describes the procedure to replace the bearing and it's associated parts. The parts appear to be a bearing, an o-ring, a snap ring, a small package of grease, a grease slinger and a dust boot. The manual references that all these parts should be available as a kit, yet it doesn't list any part numbers.

I just want to buy this kit as it is bound to be hundreds of dollars cheaper than buying a new driveshaft. I found a part number for what appears to be the bearing (88951975). I can't tell if this part number is just the bearing or the whole kit? Can anybody with access to the GM parts database help me?

Thanks,
Mike McClure

CadiBlk · #81 (**permalink**) 03-05-09, 07:53 PM

I got a new driveshaft today and on the 30min ride home from the dealer I didn't hear anything but the road noise from my KDWs. It was glorious.

I just want to say thanks again to all who chimed in and helping me get that noise solutioned in as few trips as possible. I look on the bright side, I got a fresh diff put in for no reason with 2 weeks left on my warranty.

nickwsu2006 · #82 (**permalink**) 09-21-09, 11:45 AM

Did anyone ever figure out what the GM part number 88951975 actually entails? Is it possible to service the carrier bearing instead of replacing the whole driveshaft?

Thanks

darkman · #83 (**permalink**) 09-21-09, 12:11 PM

GMgenuineparts.net shows that part number to be the bearing. ($120 mrsp).

nickwsu2006 · #84 (**permalink**) 09-21-09, 12:14 PM

Thanks a lot. still seems funny to sell a part that is supposedly "non-serviceable" doesn't it? There has to be a way to fix that carrier bearing without buying a whole new driveshaft.

darkman · #85 (**permalink**) 09-21-09, 12:20 PM

Quote:

Originally Posted by mikemc

There are specific instructions in the factory service manual called "Propeller Shaft Center Support Bearing Overhaul". It clearly describes the procedure to replace the bearing and it's associated parts. The parts appear to be a bearing, an o-ring, a snap ring, a small package of grease, a grease slinger and a dust boot. The manual references that all these parts should be available as a kit, yet it doesn't list any part numbers.

I just want to buy this kit as it is bound to be hundreds of dollars cheaper than buying a new driveshaft. I found a part number for what appears to be the bearing (88951975). I can't tell if this part number is just the bearing or the whole kit? Can anybody with access to the GM parts database help me?

Thanks,
Mike McClure

Quote:

Originally Posted by nickwsu2006

Thanks a lot. still seems funny to sell a part that is supposedly "non-serviceable" doesn't it? There has to be a way to fix that carrier bearing without buying a whole new driveshaft.

The earlier post (above) is accurate. There is a section in the Service Manual that discusses how to replace the bearing. Additionally, as a general matter any bearing you can get to and remove is replaceable because bearings are manufactured to universal/international specifications are ultimately available from some supplier if you can locate them.

nickwsu2006 · #86 (**permalink**) 09-21-09, 01:41 PM

well, here is the low-down. The part #88951975 is a propeller shaft center support bearing and can be replaced. The bad thing is, that it is not for the V. It is for the 6spd manual or 5sp auto for the V6 base CTS. Our transmission code is MN6 or M12 and has a completely different driveshaft (which all already knew). I just wanted to clarify what that part number actually was, since I have seen it around, but never really clarified.

darkman · #87 (**permalink**) 09-21-09, 01:53 PM

Quote:

Originally Posted by nickwsu2006

well, here is the low-down. The part #88951975 is a propeller shaft center support bearing and can be replaced. The bad thing is, that it is not for the V. It is for the 6spd manual or 5sp auto for the V6 base CTS. Our transmission code is MN6 or M12 and has a completely different driveshaft (which all already knew). I just wanted to clarify what that part number actually was, since I have seen it around, but never really clarified.

That makes sense. The Service Manual does cover the CTS as well as the CTS-V, and although it often makes that distinction clear to the reader, in some places it does not.

sleepys4 · #88 (**permalink**) 09-23-09, 08:40 PM

My car is in the dealer as we speak for this noise. It happened on the way to the drag strip out of all places. Still ran! They couldn't seem to figure it out hopefully they replace my diff, then later on I will tell them that it is in fact the drive shaft(prop shaft). Thanks a lot guys!

V-Eight · #89 (**permalink**) 09-26-09, 11:38 PM

Glad it worked out

vetteboy2k · #90 (**permalink**) 10-05-09, 06:59 PM

I had a whine/whirring noise (almost like an electric fuel pump noise) at certain speeds that would go away when at a complete stop and would change tone only slightly based on MPH.

I suggest everyone look at the top of their windshield. There is a hard black plastic type weatherstrip running along the top and it was lifting off the actual windshield and allowing air to go under and over it causing the noise mentioned. Its like if you placed a blade of grass between your thumbs and blew air over the grass and you'd get a noise, same thing with the weatherstrip. Glue it back down and no more noise... was one of the hardest things to diagnose, b/c on a lift it would never happen (no airflow over the car) and it was intermittent on the street. Once the air lifted the plastic it would make the noise, but when coming back to a stop the plastic would fall back down on the windshield and you'd never know it!!!