Name that (deceleration) sound!

[CodyRx7]

Ok...

So I finally got my Longfields in and the ARB lockers back together and all that fun stuff.

I have been driving the truck around town for about a week...and for the last day or 2, I am noticing a NEW sound that I can't figure out.

The sound only occurs between 30-40mph when I let off the gas, and I'm NOT pressing the brakes.

The closest I can describe the sound is like when a semi or something large with monster DRUM brakes is stopping.

Its intermittant too....not constant.

I'll just let off the gas.....it gets to that speed and "URRRRRRRRRRRT"

Sometimes its just a quick half second of that noise.....other times its like 5 seconds of it.

This didn't happen at ALL for the first few days.

Does it sound like maybe too tight of a bearing pre-load (sounds to be coming from the front passenger side) - or maybe something else?

Glancing around there is nothing obstructing in the rotor or anything.

The sound is annoying and obviously has me concerned.

Any ideas of what it could be before I just drop it off at the dealership and lose unfathomable amounts of money?

[CodyRx7]

Also, all of the bearings up front are well packed...used one of those fancy tools and a grease gun to fill them up....

Lots of grease packed in the knuckles and birfs too.

I followed the FAQ for the bearing preload instructions and torque specs, so I'm pretty much stumped.

[FJBen]

sounds like the infamous Grrr from the d-shaft.

What are you running for caster correction?

[blunt]

I was just about to post about the same type of noise I am having with mine. I removed the front drive shaft and it got better but did not go away. The forward u-joint was bad. I also notice that my rig darts around on the road, so I am going to jack it up and look for play in the bearings and other steering items as well as the pinion nut torque. The bearing preload was recently adjusted by a shop and I am wondering if they got the correct amount. I will be watching this thread to see if anyone has an answer for you. I will post up if I find my problem as well.

[CodyRx7]

Slee caster plates.

Never had this sound before, and I've been running this way for several months.

I can sense when the angle changes for the driveshaft and the little noise that makes...

This sounds like a dump truck drum brake

Listen at about 37 seconds into this video.....THAT sound is what I hear, and I'm not stepping on the brakes at all....just letting off the gas and the car is decelerating on its own.

YouTube - NOISY BRAKES plaxton president 695

Its not pulling to a side or stopping as if I AM pressing the brakes....its just an audible noise when it happens.

[Riad]

Yep, sounds like the infamous Grrrr sound. After DC DS up front and new U joints in the rear (with grease on the shaft every 3K miles), my noise was reduced significantly. Few months ago when I was carrying few hundred pounds of mulch in the rear to do some yard work, noise was completely gone. My rear is few inches taller than my front. So one of these days I'm gonna do some thing about it, i.e. slee 4" or MT spacers up front.

Looks like you've got 8" coils? You may need some more caster correction, I could be wrong.

[FJBen]

Ok, if it's that sound, I'd thing maybe more along the lines of your e-brake setup possibly dragging...I'll have to think some more.


As for the other poster, blunt:

Sound like your caster is out of whack or you don't have the right driveshaft for the type of caster correction you have.

what correction are you using?

[CodyRx7]

8" are still sitting in the garage waiting for me to extend the brake lines and whatnot.

The 6" coils are in the truck.

So that loud drum brake noise like in the video is this infamous "GRRR"?

So if I yank the front DS it would be gone?

I do find it weird that the sound only appeared like 2 days ago...when the truck has been like this for several months daily driven.

I did have the front DS fixed (new flange added after the rear U joint failed) and new U joints...but the sound wasn't there for the first few weeks after it was installed...

Is it common for that noise to just magically appear?

[Riad]

It sounds magical but it really happens over time . Those things are always moving and new component can shift things around real fast (some times in a bad way). It would not hurt if you remove the front DS and go for a spin. If the noise goes away after that then your front is taller than your rear, I think. Not sure if your front DS is a DC but some times that helps. Although I know guys who have same issues with DC DS up front whereas my front noise was gone after a DC DS.

[peepers]

are your shafts properly lubed? seriously.

[Lugboot]

Originally Posted by CodyRx7

Never had this sound before, and I've been running this way for several months.

This sounds like a dump truck drum brake

Listen at about 37 seconds into this video.....THAT sound is what I hear, and I'm not stepping on the brakes at all....just letting off the gas and the car is decelerating on its own.

YouTube - NOISY BRAKES plaxton president 695

Its not pulling to a side or stopping as if I AM pressing the brakes....its just an audible noise when it happens.

The sound of the actual brakes at around 37 seconds in that video? That's your sound? That's the weirdest "deceleration GRRR" I've ever heard. And I have a deceleration GRRR.

Calipers sticking just enough to howl? That might pull, though.

Angry bearing? Dunno.

GO ahead and pull your front driveshaft, since it's an easy test, but I'm thinking that probably isn't the culprit if it actually sounds like brakes, based on my limited experience.

[Beowulf]

Originally Posted by CodyRx7

Listen at about 37 seconds into this video.....

That would be the sound of a dry spindle bushing.

-B-

[blunt]

Originally Posted by FJBen

Ok, if it's that sound, I'd thing maybe more along the lines of your e-brake setup possibly dragging...I'll have to think some more.


As for the other poster, blunt:

Sound like your caster is out of whack or you don't have the right driveshaft for the type of caster correction you have.

what correction are you using?

I have separated my question from this post, as it seems to be much different.

http://forum.ih8mud.com/80-series-te...ml#post3432418

Sorry to hijack your thread CodyRX7

[CodyRx7]

Well, must have been a front DS "Grrrr".

Even though I just lubed up all 3 zirk points on the front DS maybe a month ago....I greased them up again and went for a spin.

Noise was still there on deceleration.

Went back home, removed the front DS....noise 100% gone.

I would never describe that sound as a GRRRRRR...and it appears some other posters think its a very strange sound too....so I dunno.

Either way, its gone now.

I know for sure the front is taller than the rear, since Ive added hundreds of pounds to the rear with my bumper / tire / ladder / gas cans, etc...

I guess all the new mods and fiddling around with everything must have just aggitated something enough to bring out the "grrrr".

I knew my luck would run out sometime running a lot of stock components on a custom setup against the "rules".

Time to try out a DC DS.

Outside of custom work...is Slee the only option for those DC DS's?

[Riad]

Short answer is yes. Long answer is no . I called Tom Wood's DS long time ago (few years back), and they had made few for 80 (or 80's axle + tcase) from what I heard. I also called High Angle DS around about the same time and AFAIR, Jesse had told me he could also have made one for me. Anyway, I settled for Christo's proven product . I have been really happy with it, just grease that sucker every 3K miles and I am good to go.

[FJBen]

Originally Posted by CodyRx7

Time to try out a DC DS.

Outside of custom work...is Slee the only option for those DC DS's?

Slee
TOm Woods
Or get one made using a Tacoma double cab DC shaft.

[CodyRx7]

I just got off the phone with the machine shop that I had make my thick walled rear DS and reflanged my front DS recently and asked about making a DC DS.

The guy mentioned that adding (what he called) an American CV to the driveshaft wouldn't and shouldn't get rid of that grr sound unless I changed the working angle of the center diff...

?

But then some have said that just installing a DC DS magically makes the noise disappear...

Here's a question...

I was in a hurry about 6 weeks ago and stopped at a oil change place for an oil change and coolant flush and fill.

I know the "techs" below the truck were searching for all the grease zirks... I did mention to them not to OVERFILL the slip yokes, but I dont know how well they listened.

If it is overfilled....will the grease just squeeze out....or will it stay "too long" and be binding up the flanges on front diff or t-case?

[Lugboot]

Over filled, the shaft can stay "too long" and put stress on the flanges. Yes.

Also, the DC driveshaft is not a "magical" solution, but it is one that works in a lot of applications. There tends to be an ideal setup for it regarding the angle of the front pinion in relationship to the t-case. Landtank has covered this as well as others.

[Riad]

Since your front is taller, you may need more caster and so what your DS shop is telling you could be true. Still, I think you need a DC DS in addition to addressing your caster issue.

As for the grease, it squeezes out for me (rear DS only) and squirts on the mufler and smells like burning plastic or some thing, horrible smell. I got used to it though. However, it hasn't happen to my front DC DS (yet). AFAIK, greasing the DS does create more pressure for the Tcase, not sure if it would bind anything, it might I guess depending upon use/situation.

[CodyRx7]

I printed out a couple of pictures showing the Tundra/Tacoma shafts and how people have cut them to fit an LC.

I'm gonna run down to the local machine shop and see if what they can do and how much it would run through them and I'll report back.

If the price is right, I'll just have it done locally....if not, I guess I'm callin Slee and ordering one in.

[CodyRx7]

Well, good news and bad news....

The machine shop was first telling me "those CV parts are $550+". I told them how people can source an entire Tacoma/Tundra DS for like $150 with that part in it, and someone spent $88 to have it converted to fit the LC...

I managed to get the shop guy to check his used pile out back and he found a Toyota CV in excellent shape.

He said he'd have to check with the boss what they'll let it go for pricewise, but then he commented "It will probably be about half the price of new retail". (if he tries to say that thing will be like $275, he can shove it, and I'll start calling local salvage yards and find my own.)

So I'm making my way home after about a 40 mile round trip and URRRRRRRRRRRRTTTTTT.....

WTF? The noise that completely disappeared after the front DS was removed reappeared.

So much for it being a DS angle noise....

I have the CDL switch, and its been on every second I have the front DS out.

I'm driving with the front DS out and the noise still happens.

Any ideas what it can be at this point?

I have an appointment at the local Toyota dealer on Monday and if I can't track it down, I'm sure they will for a bajillion dollars.

:(

[Riad]

hmmm... Is the noise exactly same as the front? Can you tell if it is coming from the rear or front? I was gonna say earlier that once you fix the front, it's just a mater of time the rear DS will kick in but I don't think that's the case. Or is it?

[Beowulf]

Originally Posted by CodyRx7

Well, must have been a front DS "Grrrr".
Went back home, removed the front DS....noise 100% gone.

Noises are difficult/impossible to diagnose based on someone's written description of the noise. The audible noise that you referred us to in that video clip does NOT sound like a driveshaft to me. It sounds like a dry spindle bushing. Removing the front DS can cause that noise to go away because you have no drive to the front.

You probably need a DC anyway but lube the front spindle bushing before you spend your money on a DC DS thinking that the noise will go away with a new DS. [Edit... Oops, I see you charged off and bought another DS. Now you know it isn't a DS problem so you know what to do now.]

-B-

[Elijah]

Originally Posted by Beowulf

That would be the sound of a dry spindle bushing.

-B-

That's what I'm thinking as well.

[LandCruiserPhil]

Now Cody the question is...Did you lube up the inside of spindle bushing when you went through the front end? If the spindles have been replaced it will be a needle bearing for the inner verse a stock bushing. FWIW

[cruiserdan]

Originally Posted by Beowulf

That would be the sound of a dry spindle bushing.

-B-

Yup, it is indeed.