Really need help with this one.

[slimjim2525]

I just traded my 2004 Sierra 2500HD on a 2007 Sierra NNBS 1500 Z71 4X4 with 5.3. It has 54k on it and just picked it up Monday. It ran great the first two days, then the night before last I back out of my driveway, which is kind of long, and go to pull away. I fell this clunk and bang in the front end. I thought I ran over a bike or something but knew I had not. It now has this grinding/metal rubbing metal sound to it and it was worse every time I backed up, but now is constant. If youre taking a slight turn you can hear and feel grinding. I got a 12 month 12k mile bumper to bumper warranty on it so I'm bringing it to the dealer but just wanted too see if any of you had an idea. I know it's impossible to diagnose without hearing it or driving it. Would bad wheel bearings do this? Thanks in advance.

[AGT]

I have a similar issue and thought it might be the slip yoke needing to be greased but no one replied to my question so I guess I will tackle it on my own. Enough of my bitching like a little girl. I get a clunk when I go from reverse to drive but its just felt not heard. Then I get a small jerk again when 1st to 2nd. I hope you and I don't both have trannsmissions on their way out.

 

When they do tell you please let me know. I hope to fix mine this weekend.

[slimjim2525]

Mine feels like it is coming from the front end. It does not feel like it is from the drive shaft or tranny. I swear I feel it in the front hubs or transfer case maybe.

[dataspng]

Check your front wheel bearings... if the trucks lifted its pretty common problem. Another thing to check is the boots on the half shafts on the front axle, crawl under and see if any are cracked or damaged which will let water in and the grease out and cause them to fail early.

[slimjim2525]

I took the drivers side wheel off and the rotor you can move by hand a good inch. Passenger side barely moves an 1/8 of an inch. CV boots look good. Could this be the wheel bearings?

[AGT]

Sounds like it.

[8.1HD/ALLISON]

Don't have to take the wheel off to check bearings. Jack front end up and wiggle wheel side to side then up and down. If you have any play somthings loose.

[slimjim2525]

Don't have to take the wheel off to check bearings. Jack front end up and wiggle wheel side to side then up and down. If you have any play somthings loose.

 

Jacke up the front end. Kept the wheel on. The whole wheel and tire moves quite about and loose. So what's the diagnosis??

[AGT]

Check both sides but that side needs a new bearing

[txab]

[Doug_Scott]

I took the drivers side wheel off and the rotor you can move by hand a good inch. Passenger side barely moves an 1/8 of an inch. CV boots look good. Could this be the wheel bearings?

 

 

I know others have said to check wheel bearings with the wheel on. This is due to your truck having hat type rotors. They are not attached to the hub, they just slide on. thatis why you can move with the wheel off. You could also take the wheel off and put wheel nuts back on.

If you are getting a large amount of movement, get it fixed now. The only thing hold the wheel and hub to the truck is the caliper.

[slimjim2525]

I took the drivers side wheel off and the rotor you can move by hand a good inch. Passenger side barely moves an 1/8 of an inch. CV boots look good. Could this be the wheel bearings?

 

 

I know others have said to check wheel bearings with the wheel on. This is due to your truck having hat type rotors. They are not attached to the hub, they just slide on. thatis why you can move with the wheel off. You could also take the wheel off and put wheel nuts back on.

If you are getting a large amount of movement, get it fixed now. The only thing hold the wheel and hub to the truck is the caliper.

 

I am getting it towed to the dealer. I agree. It is not safe at all.