95 chev k1500.....humms when I let off the gas at highway speeds....

[ZEEK1223]

I searched a little online, and the symptoms seem to lean to the rear end differential. I tried pushing it while in park, and there is just normal movement. The truck has 240,000, but the body and everything is in really good shape. Looking for any advice you guys can offer as far as repairing. I really love this truck, and would hate to let it go. But it looks like it could be a spendy repair that could cost as much as the truck is worth......thanks

[Macgyver55]

Noises are hard to explain, and even harder to diagnose without actually hearing them. Could be as simple as a u-joint or wheel bearing. I wouldnt write it off until you get an "in person" opinion.

[Tyler23]

even if you have to pay as much as its worth to get it fixed. if you still like it you would prolly be money ahead just to keep it vs. spending alot of money to get something dif or even worse getting a loan

[Jeremy airjer W]

I would try two things. One is does it make the same noise with the trans in neutral and I would check the front joint on the rear shaft. If the noise is still there and the front joint is o.k. than I would probably dig into the rear diff a little more. At least pull the cover and look for anything unusual.

[ZEEK1223]

I noticed a squeak coming from the rear end. I put blocks under the front tires, and had a buddy spin the tires on the ice while I looked for the noise. The squeak seems to come from the rear joint on the drive shaft. It only makes the squeak noise at slow speeds. When I let off the gas at highway speeds there is a humm, and also a noticeable drag. Like the truck slows down faster. The humm and the drag stays the same even in neutral.....

[Macgyver55]

Sounds like you have a seized/binding u-joint.

First they get dry, then they get tight, then they squeak, then they get loose, then lastly you turn into one of those guys sitting on the side of the road. Get those u-joints checked out!

[fishinben351]

that sounds normal to me...my f-150 hums when i let off the gas at around 50 right after the od kicks in, my buddys chevy does the same thing... and his is brand new... i dont think its a big deal...

[fishinarc]

Also sounds to me like u have a bad ujoint. Take the drive shaft out and feel the movement in them if they are stiff replace them. Pop the caps off the rear ujoints i would be willing to bet that they are rusted and there is no grease. Don't do this unless u now how to replace them because if they are rusted and the needle bearings fall out u will not be able to put it back together and u will have to bring the drive shaft shop and have them replaced.

[ZEEK1223]

I had a buddy change both front and rear u-joints, and the problem is fixed. They were dry, and starting to seize. My truck will remain on the road!!!! He did it all for a case of beer.....what a guy!!!