So today i was driving on a 100km/h road and i came up behind vehicle and had to slow down, as i was following this vehicle i began to hear a howling noise coming from the diff I think. It will only howl going 95 to 105 km/h and when i step on it it will stop. I was thinking a bearing has begun to go but want to make sure.

 

fill out your sig so we know what you have. if it is a quad cab long bed it might be the carrier bearing. thats what mine was doing when i replaced it.

 

ya its a 04.5 quad cab shortbox

 

anyone have an answer?

 

also feel around the drive line after sa good drive to see if anything in hotter than it should be. could just be a u-joint. since you have a short bed you dont have a carrier bearing.

 

Ive got just about the same exact thing going on with my truck. Its at the dealer now getting diagnosed. I'll post up the outcome.

 

I used to have a '65 Pontiac that did that. Turns out it was the nut that holds the yoke on the diff. It got loose and allowed the pinion to move back and forth. On acceleration, it would move forward. On deceleration, it would move back and rub against the carrier. Tightening the nut stopped it, but it kept getting loose.

 

Dealer called and said it was the driver side front U-Joint. $390 installed + tax. The only thing different between my noise and yours was, mine does it at almost any speed, at certain points it will go away, but no set pattern, it was sparratic.

 

no warranty?

 

k thanks i will get those things checked out

 

Mine did the same thing, it was worse when cold. I thought it was the rear end. Then I noticed that the rear outside brakes were worn, it was a howl not a typical high pitch squeal. Canged the brakes and the howl went away.

 

No, im at 40K so my bump to bump is out and I guess they dont consider the front axle components as part of the "Drivetrain"

Oh and BTW, the u-joint wasnt the problem, the dealer doesnt know what is wrong with it. But, the ujoint was very bad and needed to be replaced regardless.