9 inch noise - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 09-26-2005, 08:38 PM
Member
 
Join Date: Aug 2005
Location: Iowa
Posts: 82
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
9 inch noise

I have a 79 T-Bird with a 9 inch in it. When I am going down the road I can hear a hmmmmm, well not sure how to describe it, but it almost sounds like I can hear something turning as far as either my driveshaft or something in my rear end. I also have a leaking seal. Fluid was ok. Is my driveshaft out of round? U-Joint? Do I have a bearing going bad on my axle?
Thanks in advance
Chirs Diedrick

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 09-26-2005, 10:52 PM
Ghetto Jet's Avatar
current hot rod: CTS-V
 

Last journal entry: Lets Get Started With the Improvements
Last photo:
Join Date: Nov 2003
Location: Pennsylvania
Age: 28
Posts: 1,726
Wiki Edits: 0

Thanks: 10
Thanked 5 Times in 5 Posts
Chris, is it a humming sound?
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 09-26-2005, 11:47 PM
xntrik's Avatar
Save a horse, Ride a Cowboy.
 
Last photo:
Join Date: Jul 2005
Location: Arkansas
Posts: 5,131
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
You have a 79 with a 9 inch?????
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 09-27-2005, 08:55 PM
Member
 
Join Date: Aug 2005
Location: Iowa
Posts: 82
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
It is a humming/ vibrating sound. Yes my 79 has a nine inch and I believe most did.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 09-27-2005, 09:48 PM
66GMC's Avatar
Get in, sit down, hang on
 

Last journal entry: Cab Removal
Last photo:
Join Date: May 2005
Location: Olds, Alberta Canada
Age: 56
Posts: 2,761
Wiki Edits: 0

Thanks: 32
Thanked 90 Times in 85 Posts
Quote:
Originally Posted by cdiedrick
It is a humming/ vibrating sound. Yes my 79 has a nine inch and I believe most did.
Yeah, I think that's correct, too. It does have the removable carrier, right?
I think the other offering for that year was a 8.7" 'WER' axle that had a cover on the back.

The T-Birds had a body style change (much smaller) for 1980, and they would not have a 9".

Reading between the lines a bit ... if the pinion seal is leaking, it's possible that the rear pinion brg is getting sloppy. Those 9" were awesomely strong though ... they even use a pinion pilot bearing that really helps to keep that pinion shaft straight and true.

Don
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 09-27-2005, 09:51 PM
Ricky Rocket's Avatar
Drive it like a rental!
 
Last photo:
Join Date: Aug 2005
Location: North Dakota
Posts: 165
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
9" Noise

Could be a few different things, first a couple of questions for you. Does the noise change with road speed or engine speed? Does it change with the road surface? Does it change when you let off the gas or accelerate?

Your answers will help to narrow it down.

Rick
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 09-30-2005, 04:00 PM
Member
 
Join Date: Aug 2005
Location: Iowa
Posts: 82
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
9 inch

Well, I will be taking my car on a cruise this weekend. I will listen carefully to how is sounds at different highway and engine speeds. All I know so far is its there and at highway is consistent.
Thanks guys
Chris
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 09-30-2005, 09:25 PM
xntrik's Avatar
Save a horse, Ride a Cowboy.
 
Last photo:
Join Date: Jul 2005
Location: Arkansas
Posts: 5,131
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by cdiedrick
It is a humming/ vibrating sound. Yes my 79 has a nine inch and I believe most did.
There were some 8.8s in the Bird and Cougar, and even in the leaf spring Granada/Monarch in 80, their last year.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 10-02-2005, 05:58 PM
Member
 
Join Date: Aug 2005
Location: Iowa
Posts: 82
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
further info

This is kind of odd, but the noise was there when I got the car out. I only really noticed it at highway speeds, and as I sped up, the noise went with me. Then mysteriously it went away, then would come back, then go away. There really were no drastic changes in road conditions, so I am stumped. Bottom line, leak is still there no matter what.
Chris
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 10-02-2005, 06:03 PM
Ghetto Jet's Avatar
current hot rod: CTS-V
 

Last journal entry: Lets Get Started With the Improvements
Last photo:
Join Date: Nov 2003
Location: Pennsylvania
Age: 28
Posts: 1,726
Wiki Edits: 0

Thanks: 10
Thanked 5 Times in 5 Posts
Quote:
Originally Posted by xntrik
There were some 8.8s in the Bird and Cougar, and even in the leaf spring Granada/Monarch in 80, their last year.

I believe Ford didn't start using the 8.8 until 1983.
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 10-03-2005, 08:50 AM
xntrik's Avatar
Save a horse, Ride a Cowboy.
 
Last photo:
Join Date: Jul 2005
Location: Arkansas
Posts: 5,131
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by Ghetto Jet
I believe Ford didn't start using the 8.8 until 1983.
The 80 Monarch deluxe version, (interior like the Versailles but without the roof) wore the 8.8 on leaf springs with drum brakes 57 1/2 wide, 2.47 gear. I robbed the rear and replaced it with an 8 and sold the cars. I know where there is one sitting right now, and am trying to get it.

I stumbled into this when buying Versailles for their disc 9", and I was replacing them with 8 " from a Granada, and reselling the cars,,,,,,, so, if you see a Versailles with an 8 inch.... Ford didn't build it.

Last edited by xntrik; 10-03-2005 at 09:21 AM.
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 10-06-2005, 08:45 PM
Member
 
Join Date: Aug 2005
Location: Iowa
Posts: 82
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
rear

Again, does anyone have any ideas to this problem. Only noticable at highway speeds, does not seem to change with road conditions, it is more of a vibration vs a hum, and I go through pinion seals.
Thanks
Chirs
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 10-06-2005, 10:24 PM
66GMC's Avatar
Get in, sit down, hang on
 

Last journal entry: Cab Removal
Last photo:
Join Date: May 2005
Location: Olds, Alberta Canada
Age: 56
Posts: 2,761
Wiki Edits: 0

Thanks: 32
Thanked 90 Times in 85 Posts
Quote:
Originally Posted by cdiedrick
Again, does anyone have any ideas to this problem. Only noticable at highway speeds, does not seem to change with road conditions, it is more of a vibration vs a hum, and I go through pinion seals.
Thanks
Chirs
I think you'll have to take it apart and look for yourself, Chris. (Or is it really Chirs? You've typed it a couple of times that way.)

If it's a driveshaft imbalance, I doubt that it would fade in/out like that.

Are the U-joints tight and greased?

Is there any lateral movement (up/down or side-to-side) in the yoke or anywhere else on the drive line?

Does the sound or vibration change on accelleration / decelleration?

Are there any obvious reasons that might lead you to believe that the pinion shaft or yoke may be bent? Anyone been doing "gear drops"?

Is there a chance that anything (cord, wire, etc) could be wound up on the diff yoke?

Have you done anyhing other than change seals? And did you lube the seal before installing it on a dry pinion yoke?

(I'm trying to think of things that keep taking out the seal AND/OR causing vibration)

You're going to have to be more specific, and tell us what you have tried.

HTH,
Don
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 10-07-2005, 09:11 AM
66GMC's Avatar
Get in, sit down, hang on
 

Last journal entry: Cab Removal
Last photo:
Join Date: May 2005
Location: Olds, Alberta Canada
Age: 56
Posts: 2,761
Wiki Edits: 0

Thanks: 32
Thanked 90 Times in 85 Posts
Another couple of thoughts ...

Chris, what I'm about to say is intended as discussion - not public humiliation, as I have no idea of your skill level ... OK?

Now somebody correct me if I'm wrong here ...

The only time that you need to replace the crush sleeve is if you do anything that changes the position of the pinion shaft or the length of the assembled pinion and bearings ... correct?

The crush sleeve is only there to maintain a specified preload on the bearings, right?

To my way of thinking, it seems to me that a lot of guys are replacing these when they really don't need to ... i.e. when doing a seal replacement only. IF you are also changing either of the bearing cup/cones then yes ... change the crush sleeve.

Following this scenario ... if the average DIY guy that doesn't know better does replace the crush sleeve and just "snugs" up the yoke without torquing it to specs ... I'm thinking that that would allow the outer pinion bearing cone to wander significantly, as it would not be seated in the cup. Like I said earlier, a properly assembled 9" pinion shaft should be rock steady.

The other thought was to check to make sure that all of the needle bearings are in that rear u-joint. It's quite easy to drop a few of them when removing the driveshaft from the yoke. One or two missing rollers would be enough to screw things up in there... and that would display "come and go" type symptoms.

Opinions on my theories, anyone?

Last edited by 66GMC; 10-07-2005 at 09:17 AM.
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 10-08-2005, 03:55 PM
xntrik's Avatar
Save a horse, Ride a Cowboy.
 
Last photo:
Join Date: Jul 2005
Location: Arkansas
Posts: 5,131
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
You could be chasing tire hum. Some vary widely as per road surface texture.

Here's what I would do.
Jack it up supported under the rear housing,
check the ujoints
pull the driveshaft off rear
turn that pinion to see if it is smooth (bad bearings)
check those rear wheel bearings for smooth... lots of bad ones will feel ok
pull that yoke and replace that seal
torque that yoke against the parking brakes,---- what is it 175 ???

you might get by without replacing the crush sleeve..... once it is crushed it doesn't have the resiliency that it originally did and the pinion bearing preload will not be accurate. (Think of it sort of like the stretchy engine head bolts that are used today.) that's why solid spacers are so popular.

check for tire noise. I'd almost bet that is your problem.
Reply With Quote Quick reply to this message

Recent Transmission - Rearend posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Ford 9 inch rear end... whinning noise??? bg Transmission - Rearend 5 09-28-2005 01:03 PM
low profile tires for 15 inch Halibrand reps peranaman Suspension - Brakes - Steering 3 06-28-2005 04:36 AM
9 inch or 8 inch Cowtown Punk Transmission - Rearend 3 08-13-2004 08:10 PM
Knocking noise, HELP! Please!! fireforsin Engine 4 01-04-2004 11:31 AM
valvetrain gurus: need help identifying mysterious valve noise blndweasel Engine 10 03-04-2003 07:59 PM


All times are GMT -6. The time now is 05:55 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.