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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I always ask the color when my friends are describing their car... and immediately ask the interior color too...
It helps me imagine their following sumptuous description...
Twin-turbos, 8 speed automatic, Walnut grain...
fuzzy DICE... Plastic idols affixed to the dash (etc.)...
all helps in the visualizations
but... for your car I imagine a noise.
Okay... a 70 mph whine usually means the rear end differential gears have gotten out of alignment.
It could mean a few other things... but that is the biggie!
you would only experience problems from the diff if there was a substantial increase in torque from the different engine as there would be less than 10% difference in torque ratings , Any noise from the diff would be naturally occurring from wear or oil
diff noises indicating bearing problems are a whine on drive or coasting , an growl on deceleration and a harmonic whine or growl when the vehicle is held at steady speed Other than those indications , I would be more inclined to suspect wheel bearings and brake associated noises
wheel bearings are normally more pronounced on cornering
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.
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.