Rearend Noise

[rsjohnsn]

No, not that kind! I have replaced the rear limited slip at about 4-5k miles ago and now I have established a rear vibration when I put her in a turn at low speeds, mainly taking off. I have checked and replaced the rear brakes, checked the outer axle bearings and even drained and checked the rear diff and all looks and feels good. Any suggestions? I am going to replace the rear fluid and add just a tadd more of the limited slip additive to see if it might be the clutches doing this since they only have 4-5k on them. Now when I say vibration, it is bad enough to make the passenger seat move in a vibrating manner.

Thanks
Scott

 

[DaveBen]

Sounds like your clutches trying to slip when you are turning.

Dave

 

[rsjohnsn]

Thats what I am thinking but it just started. Shouldn't it have started right after I installed the new clutches?

Thanks
Scott

 

[DaveBen]

Not necessarily with the trailer that you have in your avatar. You could be using it hard to get that sort of noise. Your idea of the LS additive is a good one. I have never had a LS make that noise, but friends have.

Dave

 

[rsjohnsn]

Just so happen you mentioned that, I just got back from putting 3000+ miles on the truck with the trailer Mon - Wed. I didn't have any real heavy loads but I did run her hard averaging 1000 miles a day. After I got home from the trip is when I noticed the vibration. I have added the additional additive and new grease but the vibration is still there. I have determined that it goes away with a little bit of speed (just off idle) but anything below that and it is there but only in a turn. I can't see this being a bearing unless I am putting extra stress on one when it is in a turn but I would think it would do it all the time plus there is no slop or rough feeling to any of the bearings. I don't know, I think I am going to write it off as the clutches. The only problem with that is that I am on the road alot and when it breaks, I will be at the furtherest point from home. Any other ideas? Somebody needs to ease my mind and tell me it is the clutches!!

Thanks
Scott

 

[Kleetus]

Does it matter which way you're turning or how much your turning? Does it do it in reverse? Have you tried it on gravel to see if the inner tires are turning up the grave moreso than an open diff would? Couple of things to try. I'm not a big fan of the LS additive, it just makes the clutches slip, then glaze, then become useless.

You say it's strong enough that it makes the seat shake? exactly how fast are you going at that point?

 

[rsjohnsn]

Does it matter which way you're turning or how much your turning? No Does it do it in reverse? Yes Have you tried it on gravel to see if the inner tires are turning up the grave moreso than an open diff would? I couldn't see a big difference Couple of things to try. I'm not a big fan of the LS additive, it just makes the clutches slip, then glaze, then become useless.

You say it's strong enough that it makes the seat shake? exactly how fast are you going at that point? I am just off idle and the faster I go the less it does it to a point that it completely dissapears

Thanks
Scott

 

[Kleetus]

Out of curiosity, have you tried it in 4x4? Dunno, might be the clutches, but if it is, you're one of the few that really have one that works. Heck I'd swap ya!

Is there any possibility you could enter a turn with the window down, get it to start making the vibration and shut the engine down to hear if there's any noise associated with it that the engine could be hiding?

What's odd is that the problem is coming up now, as opposed to right after the clutches were installed. I mean, they get looser with time, not tighter.

 

[Super 05]

The wifes ride is a 2003 Expedition that was doing the same thing. Complete stop going into a turn (either way)just off idle sounded like the front tires were too big and rubbing the inner fender. Took it to dealer they took a ride with me and immediately told me it WAS THE CLUTCHES in the rear end. Changed those out and haven't heard the sound anymore. Different vehicles I know but hope this helps.

 

[Kleetus]

well then you MIGHT BE OKAY if it was JUST THE CLUTCHES lol...

Your description of the tire rubbing puts it into place. RSJohnson, if that accurately depicts your sound, then yeah, I'd say your safe, and leave it alone!

My cousin's GT had an Auburn Pro series limited slip in it, and it was very noisey, but man it never failed, at 70k miles, and two gear ratio changes, with 496 HP on it, it was fantastic. People would run out of gas stations trying to get us to stop because something was broken in the car, and after 5 minutes of explaining that we paid like 600 bucks for it to sound that way, they'd look confused and slowly walk away... it was great!