Vehicle has 70 k miles, all whell drive. The gears were replaced a year ago. Over the past 3 months we notice that when the vehicle speed is 35-40plus, and you take your foot off the gas, the front end whines. As soon as you give it gas again, the sound, while still faintly there is hardly noticable. he same shop who replaced the gears suggests that cadillac told him it was a normal sound to have the hum/whine from the front end. I do not recall hearing it until recently.
Is this normal????
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Re: 2003 differential whine/noise
The last time I had a hum coming out of the area of the differential it was an inside axle bearing going bad. In my case there were four bearings (one on each end of each axle). It was a Toyota. We changed one bearing after listening very carefully and guessed right. I don't know if Cadillac is built similar in this regard but I'm thinking it may be. It was a speed sensitive hum sound like you describe.
I have an 03 with the same problem. At 38k the dealer replaced the gears, bearings, seals, etc. Now the vehicle has 68 k and the gears are shot again. This seems to be an inherent problem with the front axles. I guess thats what I get for buying a Cadillac
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Needs to be off the ground to see for sure. When it comes to differential bearings I replace all them, to include the axle bearings. Depends on the vehicle. No year make or model. the differential also needs looked at.
There are bearings in the rear diff that make a "whining" noise it can be repaired by replacing the bearings. Here is how its done;
1. Jack up the rear end and support if correctly with jack stands. 2. remove the wheels and expose the axles 3. remove the differential cover and drain the differential 4. rotate the main gear inside and expose the take down bolt. (8mm) 5. remove the take down pin in the spline drive. 8mm nut 6. remove the axles and remove the main gear. then take out the bearings. 7. replace the bearings and reinstall the components in reverse order. 8. refill the differential.
Try changing the gear oil in the rear axle. Be sure to add a Slip Differential Additive paste to it (Autozone sells the paste and the gear oil).
The noise is coming from the differential in the rear axle and you will hear it when the vehicle changes from one direction to the other. Drive a hard zigzag line in a vacated parking lot and you should hear it at each shift in direction.
Change the front axle gear oil also if it had never been down. Usual interval for both is 30,000 miles.
it is possible that you've got an issue with your power steering system, but the noise should be equally noticeable in both forward and reverse. the front differential is inside your transmission and if the differential is worn it will whine. if you pay close attention you may notice the noise when in first gear going from acceleration to deceleration at about 20mph. if this happens, it's most likely your transmission that needs to be replaced.
Spider gears are not difficult to replace...however, if they are worn, usually this contaminates the lube and can cause damage to carrier as well as pinion bearings...Those require precise settings with special tools and lots of experience to replace. Since you have had the noise for a long time, I can safely assume that debris has been building all that time. Spider gear set is not cheap...You may want to risk doing the job, but I would likely find another exact match, drum to drum replacement in a scrapyard. Generally I will only recommend a spider gear replacement if you have snapped a gear in half...an immediate failure does not generate the kind of fine metal that wear does.