Goosy-***** whine coming from rear end when rollin real low.......ideas?

[Grocery Getter]

Alrighty....... I have been hearing this noise coming from the rear end and I am pretty sure it's one or both wheels but I could be wrong. When I roll with my bags about half way out(as low as I can drive w/o issue) I get this sound coming from the pass rear(from what I can tell). It sounds like a goose honk or...ok, you know the sound a semi makes when it come to a stop? It's kind of a goose honk sounding low whine. I know I sound like a ******* but there is no better way to explain it.

At first I thought my brake pads had worn down to the waring tabs(is sounds like that for the most part but more like a goose) but that was ruled out because when I air up an inch or so the sound goes away. It mostly happens when I stop toward the end of the stop at low speeds but sometimes I hear it when the back end bounces on bumps but more so when stopping, not breaking but right before I come to a complete stop, maybe the last 10 rotations of the wheels and also only when making a nice gradual stop. If I slam on the brakes and stop quick no noise.

I'm thinking u joints but they are all solid nothing lose. Maybe bushings? I don't know but it is driving me crazy. It is definitely only when I drive with the bags aired out and am sitting low.

Any suggestions much appreciated. I am going to try and isolate it this week and resolve it this weekend.

 

[Nickleahy23]

it has to be the u joints/bearing somewhere between the trans and in the rear end

the only think chanring is the pinion angle, nothing else in the geometry changes, and nothing else is spinning..lowering it wouldnt change anything out by the wheels, so it has to be coming from bad pinion angle /some type of bindage when your aired out

 

[Grocery Getter]

it has to be the u joints/bearing somewhere between the trans and in the rear end

the only think chanring is the pinion angle, nothing else in the geometry changes, and nothing else is spinning..lowering it wouldnt change anything out by the wheels, so it has to be coming from bad pinion angle /some type of bindage when your aired out

That's what I think too for the most part but I don't know how to find out and of course the simple answer, "just don't roll that low" is just not an option. I just don't get it though because the truck is level, why would it be messing with the pinion angle......

It's always gotta be somethin' though ain't it?

 

[Nickleahy23]

That's what I think too for the most part but I don't know how to find out and of course the simple answer, "just don't roll that low" is just not an option. I just don't get it though because the truck is level, why would it be messing with the pinion angle......

It's always gotta be somethin' though ain't it?

well think of it this way...stock height you have a set pinion angle...so now dropping it down, everything changes...the axle rotates, the trans is dropped lower, changing the driveshaft angle to the rear end etc..are you running the stock link set up with bags in place of the springs? most of the time, the pinion will be pointed to high when its slammed..im not really sure how you can adjust it through since the links are fixed and not length adjustable..

 

[chistoso]

Could it be one of your tires rubbing on the inner liner when you go too low? The tires are bigger than the 22's yeah? I know mine doesn't go as low as yours but it would do something similar and once the auto ride kicked in and raised it a 1/2 or so the noise would go away. One day I removed the wheels and noticed a mild rub on the pass side liner, trimmed it and viola! Problem solved.

---------- Post added at 08:04 AM ---------- Previous post was at 08:00 AM ----------

BTW, Thanks for my new sig.

 

[Grocery Getter]

Could it be one of your tires rubbing on the inner liner when you go too low? The tires are bigger than the 22's yeah? I know mine doesn't go as low as yours but it would do something similar and once the auto ride kicked in and raised it a 1/2 or so the noise would go away. One day I removed the wheels and noticed a mild rub on the pass side liner, trimmed it and viola! Problem solved.

---------- Post added at 08:04 AM ---------- Previous post was at 08:00 AM ----------

BTW, Thanks for my new sig.

Hahah! nice. Not the liners(they don't exist int he rear) and it's not a rubbing noise it's more like the sound a semis air brakes make..... I think Nick is spot on. I'm going to my boys house this week to figure it out......I'll get that goose

 

[NORCAL SS]

due to the rear end design pass side gets pushed out a lot when you air out the back so make sure its not rubbing.

what is your pinion angle set at ride height and when its aired out?

 

[Grocery Getter]

due to the rear end design pass side gets pushed out a lot when you air out the back so make sure its not rubbing.

what is your pinion angle set at ride height and when its aired out?

It's definitely not rubbing. I don't know what the pinion angle is set at at ride height. I'll have to measure but fender to ground at ride height is probably 31''. How do I check what the pinion angle is set at?

Also, is there anyway to minimize the effect of the pan hard shifting the axle to the pass side? I have like 1-2'' clearance on the drivers side and the pass side hits mid sidewall when I air all the way out, I'd really like to get the pass side to tuck so I can see how low it is when aired out

 

[SQNALI]

hmmmm - I would check the transmission rear output shaft seal rubbing againt the driveshaft flange. at the height where it makes the noise.

I would also remove the rear driveshaft from the rear differential pinion flange and try to rotate that u-joint by hand, if it feels stiff in any direction, replace it.

oh, maybe check e-brake cable clearances with the tire - should be fine but just in case

GL