We have a howl..
Thread Starter
|
Registered User
Joined: Apr 2010
Posts: 37
Likes: 0
From: Spruce Grove, Alberta, Canada
We have a howl..
The truck has developed a howl, that I feel is coming from the rear.
The sound is most prevalent when you are on the throttle, kind of still there when coasting or off throttle.
The sound is most prevalent when you are on the throttle, kind of still there when coasting or off throttle.
I have the same noise. And haven't figured it out either. Yet nothing has broke yet. Mine's been there for a few years. You can rest easy knowing its not from the transmission. Cause it was still there after my trans self destructed. Mine sounds like it comes from the front somewhere.
Champion
Joined: May 2008
Posts: 4,839
Likes: 5
From: Apex, NC
Sounds to me like its time to rebuild your rear axle. The sound is either your pinion bearings or R&P gears.
Read this and tell us which one sounds more accurate...
Read this and tell us which one sounds more accurate...
GEAR NOISE
Axle gear noise can be caused by insufficient lubricant. Incorrect backlash, tooth contact, or worn/damaged gears can cause noise. Gear noise usually happens at a specific speed range. The range is 30 to 40 mph, or above 50 mph. The noise can also occur during a specific type of driving condition. These conditions are acceleration, deceleration, coast, or constant load. When road testing, accelerate the vehicle to the speed range where the noise is the greatest. Shift out-of-gear and coast through the peak-noise range. If the noise stops or changes greatly, check for insufficient lubricant. Incorrect ring gear backlash, or gear damage can cause noise changes. Differential side and pinion gears can be checked by turning the vehicle. They usually do not cause noise in straight-ahead driving. These gears are loaded during vehicle turns. If noise does occur during vehicle turns, the side or pinion gears could be worn or damaged. A worn pinion gear mate shaft can also cause a snapping or a knocking noise.
Axle gear noise can be caused by insufficient lubricant. Incorrect backlash, tooth contact, or worn/damaged gears can cause noise. Gear noise usually happens at a specific speed range. The range is 30 to 40 mph, or above 50 mph. The noise can also occur during a specific type of driving condition. These conditions are acceleration, deceleration, coast, or constant load. When road testing, accelerate the vehicle to the speed range where the noise is the greatest. Shift out-of-gear and coast through the peak-noise range. If the noise stops or changes greatly, check for insufficient lubricant. Incorrect ring gear backlash, or gear damage can cause noise changes. Differential side and pinion gears can be checked by turning the vehicle. They usually do not cause noise in straight-ahead driving. These gears are loaded during vehicle turns. If noise does occur during vehicle turns, the side or pinion gears could be worn or damaged. A worn pinion gear mate shaft can also cause a snapping or a knocking noise.
BEARING NOISE
The axle shaft, differential and pinion gear bearings can all produce noise when worn or damaged. Bearing noise can be either a whining, or a growling sound. Pinion gear bearings have a constant-pitch noise. This noise changes only with vehicle speed. Pinion bearing noise will be higher because it rotates at a faster rate. Drive the vehicle and load the differential. If bearing noise occurs the pinion rear bearing is the source of the noise. If the bearing noise is heard during a coast, front bearing is the source. Worn, damaged differential bearings usually produce a low pitch noise. Differential bearing noise is similar to pinion bearing. The pitch of differential bearing noise is also constant and varies only with vehicle speed. Axle shaft bearings produce noise and vibration when worn or damaged. The noise generally changes when the bearings are loaded. Road test the vehicle. Turn the vehicle sharply to the left and to the right. This will load the bearings and change the noise level. Where axle bearing damage is slight, the noise is usually not noticeable at speeds above 30 mph.
The axle shaft, differential and pinion gear bearings can all produce noise when worn or damaged. Bearing noise can be either a whining, or a growling sound. Pinion gear bearings have a constant-pitch noise. This noise changes only with vehicle speed. Pinion bearing noise will be higher because it rotates at a faster rate. Drive the vehicle and load the differential. If bearing noise occurs the pinion rear bearing is the source of the noise. If the bearing noise is heard during a coast, front bearing is the source. Worn, damaged differential bearings usually produce a low pitch noise. Differential bearing noise is similar to pinion bearing. The pitch of differential bearing noise is also constant and varies only with vehicle speed. Axle shaft bearings produce noise and vibration when worn or damaged. The noise generally changes when the bearings are loaded. Road test the vehicle. Turn the vehicle sharply to the left and to the right. This will load the bearings and change the noise level. Where axle bearing damage is slight, the noise is usually not noticeable at speeds above 30 mph.
Last edited by 95_318SLT; May 10, 2010 at 02:23 PM.
I drove my truck earlier and it only shows up on deceleration around 40mph. I changed the rear gear oil about 3 months ago and no chunks or anything in the rear. But it sounds like its coming from the front, almost in the bell housing area.
Thread Starter
|
Registered User
Joined: Apr 2010
Posts: 37
Likes: 0
From: Spruce Grove, Alberta, Canada
Well tried what the note asked for.
Ran her up to 60, thats where the noise is its loudest. As soon as I took my foot off the gas, the noise quit. There was no noise, so it looks like its time to check fluid level. What is run in these thing, or what best. The tag shows that I have a 8.25, with 3.5 and LSD.
Ran her up to 60, thats where the noise is its loudest. As soon as I took my foot off the gas, the noise quit. There was no noise, so it looks like its time to check fluid level. What is run in these thing, or what best. The tag shows that I have a 8.25, with 3.5 and LSD.
