Tomdamit said to dakota-truck on 26-Mar-98 21:31:13
> Went basck into dealer today as the rear axle was STILL whining on
> deceleration between 50 and 40 mph. This after they replaced the
> entire rear axle assy. from wheel to wheel at 2,000 miles. I got a
> call this afternoon from dealer service rep who said CC was now aware
> of the problem and is working on a fix. According to him, the whine
> isn't the fault of the gears at all, really. It's a harmonic problem
> with the sound apparently being amplified by the driveshaft. If you
> look under a 2WD Dak Club Cab you will see one of the largest
> driveshafts known to man. I mean this thing is big. It appears to be
> aluminum and apparently resonates and amplifies sound. I haven't hit
> it with a wrench but it probably would ring like a bell. I know
> this may "sound" strange but it certainly could be right. I'm going
> to wait it out. Dealer says fix could come at any time - he will keep
> me advised or I will call him. Probably 2 to 3 months but we'll see.
> Anyone else? Tom Ware Riverside, CA
> '98 CC V8, auto, "Arrest Me Red", flares ,T &H, 3 inch cat back, etc.
You are right about the aluminum shaft amplifying your gear noise,
Tomdamit. My new 4.10's were quiet as can be until I installed an
aluminum racing shaft. Now they howl like a banshee between 60 and 70
mph. The solution, of course, is just to keep the road speed at about
80!
It seems that my aluminum shaft doesn't have the damper my steel one
did, and while it got rid of all my driveline vibration, it did increase
noise somewhat. Damn GM, who would put a 7.5" gear in a 300 HP car?
-Carl
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