Rising Sun Member Forums  

Go Back   Rising Sun Member Forums > Toyota 4x4 > General Tech Forum

Reply
 
Thread Tools
  #1  
Old 05-31-2012, 08:51 AM
mod5csi mod5csi is offline
Rock Stacker
 
Join Date: May 2012
Location: Parker CO
Posts: 8
Default Looking for a 2nd opinion

Good Morning All,

I originally posted over on IH8MUD asking about a sound from what I believe was the front end. I have copied and pasted the IH8MUD post below. It was recommended I post here to see if anyone would be willing to meet up and take a listen to the sound I am having. I live in Parker at E470 and Parker Road, and I work in Aurora at Buckley AFB. Or if there is a good 80 series / Toyota / 4x4 shop around, please let me know.

Anyway, thanks in advance for your thoughts. Below is my IH8MUD post:

I hate making new threads, I have always been able to find the info I need by searching. But my Search-Fu has failed me this time.

I have a noise coming from the front end. The noise is a wa wa wa wa wa wuh wuh wuh wuh wuh sound. (more like a propeller or flat spotted tire than a baby crying wah wah sound). Not metallic, not grinding, not squealing. The volume and frequency increase with road speed and seems to peak around 40 mph. After that either wind noise drowns it out or it is going away (which I doubt). Also, the noise is only while on the power. Off throttle I do not hear it at all. And I only hear it with the windows up. I dont hear it with the windows down, and I dont hear it while driving next to it with someone else driving the truck. Its almost like a resonance more than an actual noise (if that makes sense).

1996 Lexus LX450, 190k miles, CDL, but no lockers, well maintained at Lexus for the 140k miles, no records after that.

Some diagnostics and work I have already done:

1. Removed the front driveshaft, locked the CDL; noise went away completely
2. I had the front driveshaft, rebuilt with new Toyota U-Joints and balanced out of phase at Rocky Mountain Driveline in Denver, re-installed and noise is still present.
3. I rebuilt the front end, repacked birfs, swapped sides, installed new trunion bearings, wheel bearings, axle seals, and brakes. Noise is still present.

So now I am leaning toward the differential. But before I tear into that and have to redo all the birf work I just did I wanted to check here.

Thoughts?
Reply With Quote
  #2  
Old 05-31-2012, 09:19 AM
J Kimmel J Kimmel is offline
Hard Core 4+
 
Join Date: Oct 2005
Location: Lakewood
Posts: 915
Default

bearing in your diff maybe
Reply With Quote
  #3  
Old 05-31-2012, 09:26 AM
mod5csi mod5csi is offline
Rock Stacker
 
Join Date: May 2012
Location: Parker CO
Posts: 8
Default

I should have mentioned. I am leaning towards replacing the pinion bearing before tearing into the diff. If replacing the pinion bearing is even doable without removing the entire diff from the truck. The service manual is not clear on this.
Reply With Quote
  #4  
Old 05-31-2012, 09:29 AM
DaveInDenver's Avatar
DaveInDenver DaveInDenver is offline
Hard Core 4+
 
Join Date: Jun 2006
Location: Larimer County
Posts: 6,550
Default

I had a similar sound that I thought was my transfer case output bearing. I couldn't tell for certain if it was in the diff or axle bearings, but it went away when I swapped rear axles. My guess is the pinion bearing was the culprit.
__________________
'91 Toyota Pickup
'09 Kawasaki KLR650
'12 Gunnar Rockhound 29

"They say the test of literary power is whether a man can write an inscription. I say, 'Can he name a kitten?'" -- Samuel Butler
Reply With Quote
  #5  
Old 06-01-2012, 12:54 PM
Rzeppa's Avatar
Rzeppa Rzeppa is offline
Cruise Moab Committee
 
Join Date: Aug 2005
Location: Kittredge CO, USA
Posts: 5,217
Default

Quote:
Originally Posted by mod5csi View Post
I should have mentioned. I am leaning towards replacing the pinion bearing before tearing into the diff. If replacing the pinion bearing is even doable without removing the entire diff from the truck. The service manual is not clear on this.
You have to take the diff off and apart to change the pinion bearing, and yes, after reading all the stuff you've done that sounds like the most likely culprit. And of course to get the diff off you have to slide the axles out.

But...try the simple stuff first. Make sure your pinion nut is tight. I had a vibration in the rear of my 60 and discovered that the nut was loose and had never been staked. I tightened it and staked it and my problem disappeared.
__________________
Jeff Zepp
Kittredge CO USA
1971 & 1976 FJ40s, 1978 FJ45, 1987 FJ60
Rising Sun 4WD Club, TLCA #4063
http://american3dprinting.net/
Reply With Quote
  #6  
Old 06-01-2012, 01:04 PM
mod5csi mod5csi is offline
Rock Stacker
 
Join Date: May 2012
Location: Parker CO
Posts: 8
Default

Thanks guys,

I will try tightening the pinion nut.

I picked up a stethoscope today and plan on crawling under there and listening while its in gear (and safely on jack stands).

I have done some further diagnostics based on some feedback.

1) out on a dirt road I locked the CDL in 4hi and 4lo and verified the noise is still there. I was hoping to rule out or confirm the T-Case but I still cant.

2) the noise is present outside the truck, driving next to a brick wall I was able to hear the echo off the wall (great way to diagnose wheel bearings also).

So really I am in no better place than before, but I will let you know what I come up with with the stethoscope.
Reply With Quote
  #7  
Old 06-01-2012, 02:46 PM
rockrod rockrod is offline
Lifted
 
Join Date: Mar 2011
Location: The Pinery, CO
Posts: 157
Default

Is the noise fast like at driveshaft speed or is it slower in relation to tire speed? I had a front pinion bearing go out and it was a whirring noise while driving that increased with speed. Removing the front shaft had no effect and I eventually jacked the front of the truck off the ground and spun the gears by hand with the front shaft out. Slee rebuilt the front diff for me once I knew it was a bearing.

I am in the pinery and will be more than happy to have a look.

Corey
__________________
1994 FZJ80. Elocked, MAF 3/2 Lift, BFG 315 KM2s, stock 4.10s, ARB bullbar and a Warn 8074 winch.

powered by an all-aluminum 335hp L33 Vortec V8

2004 Kona Stinky dee-lux.
Reply With Quote
  #8  
Old 06-01-2012, 03:20 PM
mod5csi mod5csi is offline
Rock Stacker
 
Join Date: May 2012
Location: Parker CO
Posts: 8
Default

Quote:
Originally Posted by rockrod View Post
Is the noise fast like at driveshaft speed or is it slower in relation to tire speed? I had a front pinion bearing go out and it was a whirring noise while driving that increased with speed. Removing the front shaft had no effect and I eventually jacked the front of the truck off the ground and spun the gears by hand with the front shaft out. Slee rebuilt the front diff for me once I knew it was a bearing.

I am in the pinery and will be more than happy to have a look.

Corey
Thanks Corey,

I will PM you after I get under there and still cant figure it out. I followed your 5.3 build on IH8MUD with a lot of interest BTW. Sounds like fun now.

The volume and frequency both seem to build as road speed increases. Whether its tire speed or driveshaft speed I couldnt say. But it seems slower than what I think the DS is spinning. And the noise went away completely when I removed the front DS.

I just had a thought but Im not sure it will get me anywhere... The DS and therefore the pinion and its bearing should be spinning at the engine RPM when in 3rd gear (1:1 ratio), correct? And then it gets reduced and slowed down by the ring gear and then sent out to the wheels by the spider gears.

I will try a couple things omw home from work...
Reply With Quote
  #9  
Old 06-02-2012, 06:05 AM
60wag's Avatar
60wag 60wag is offline
Rising Sun Member
 
Join Date: Aug 2005
Posts: 1,790
Default

I had a noise not unlike what you describe in my rear diff. It turned out to be a damaged carrier - the thing the ring gear bolts to. It may be have been due to an accident from the previous owner. If you do end up removing the diff, examine the entire thing, not just the bearings.
__________________
Bruce
'96FZJ80
'03 KTM 450EXC
"If you know what you're doing, then you aren't learning anything." - A. Lincoln
Reply With Quote
  #10  
Old 06-02-2012, 02:23 PM
sleeoffroad's Avatar
sleeoffroad sleeoffroad is offline
Rising Sun Member
 
Join Date: Aug 2005
Location: Golden CO
Posts: 872
Default

Lift Height? Mods to the suspension?
__________________
Christo Slee
KØSLE
www.sleeoffroad.com
Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -6. The time now is 06:25 PM.


Powered by vBulletin® Version 3.7.1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.