Whirring/howling from drivetrain

[Dwight McBrayer]

Alright so 5 months ago I got a 1 piece aluminum driveshaft because my u-joint was bad. Right after the install I had this Rediculous Whirring at all speeds.

I rebuilt differential with 3.73 set.
Noises gone EXCEPT for 45-60 mph only on acceleration. It's louder when I barely give it gas, and dampens when I give more. This is killing me when I've got cruise control. These intermittent chirps and whirrs.

No noise whatsoever in neutral or on deceleration. I did realize it's got a little chrip right when the clutch is fully depressed from 1st or 2nd.

I'm thinking its either bad gear alignment or low pinion load.

I've heard 3.73s and aluminum driveshafts make noises like this sometimes, but honestly it sounds stupid. If everything is right it shouldn't, right?

I need to figure out just what it is so I can drop the hammer on this douche who screwed up my car.

 

[helldiver14]

I would say its your rear end. Did you use friction modified diff fluid? It shouldn't cause any noise, but you can tell the intelligence of the person who installed the gears if he didn't use friction modifiers. Friction modified fluid allows the posi to work properly.