Differential noise when going slow - TCCoA Forums
 
LinkBack Thread Tools
post #1 of 16 (permalink) Old 10-11-2017, 06:03 PM Thread Starter
6th Gear Poster
 
Natesriv's Avatar
 
Join Date: Dec 2016
Location: Kansas City
Age: 49
Posts: 584
Garage
Differential noise when going slow

When coming to a stop, or taking off slowly I'll hear a whine from the diff. What's odd is as I come to a stop, right before that the whine increases in pitch, like something's spinning faster...but there's nothing I can think of that would make that noise. It's not the tranny shifting as I'm only going 5 mph... It's that last few feet before a stop the pitch gets higher..

Any ideas what that may be. Doesn't seem to be causing any issues....just an odd noise.

God created Arakis to train the faithful... One cannot go against the word of God.........
Natesriv is offline  
Sponsored Links
Advertisement
 
post #2 of 16 (permalink) Old 10-11-2017, 08:59 PM
4th Gear Poster
 
Kenz's Avatar
 
Join Date: Oct 2014
Location: SYR, NY
Posts: 323
Do you have an open diff, or trac-loc? Have you done a fluid change ever? As long as the fluid is full it should be quiet. Are you sure it's the diff?

96 Cougar Sport - T45 Swapped
Kenz is offline  
post #3 of 16 (permalink) Old 10-12-2017, 06:12 AM Thread Starter
6th Gear Poster
 
Natesriv's Avatar
 
Join Date: Dec 2016
Location: Kansas City
Age: 49
Posts: 584
Garage
Yeah it's the diff, coming from the rear.
Yesterday I did a hold brake, floor gas and only one set of skid marks, so I have an open diff.

Never changed, car only has 84K on it, not sure when schedule to change is. No leaks anywhere...

Just odd it does that..

God created Arakis to train the faithful... One cannot go against the word of God.........
Natesriv is offline  
Sponsored Links
Advertisement
 
post #4 of 16 (permalink) Old 10-12-2017, 11:43 AM Thread Starter
6th Gear Poster
 
Natesriv's Avatar
 
Join Date: Dec 2016
Location: Kansas City
Age: 49
Posts: 584
Garage
is there a drain port in that pumpkin? Looks like taking the back off is a PITA

God created Arakis to train the faithful... One cannot go against the word of God.........
Natesriv is offline  
post #5 of 16 (permalink) Old 10-12-2017, 12:45 PM
Kind of slapped together
 
Join Date: Jan 2010
Location: Bossier City, LA
Age: 63
Posts: 4,838
Quote:
Originally Posted by Natesriv View Post
is there a drain port in that pumpkin? Looks like taking the back off is a PITA
No, and whereas yes, it's less of one than when a diff locks up on the interstate at 75MPH ...

RwP

Fuelly
RalphP is offline  
post #6 of 16 (permalink) Old 10-12-2017, 02:11 PM Thread Starter
6th Gear Poster
 
Natesriv's Avatar
 
Join Date: Dec 2016
Location: Kansas City
Age: 49
Posts: 584
Garage
I'll have my mechanic change it then. Save me the hassle.

God created Arakis to train the faithful... One cannot go against the word of God.........
Natesriv is offline  
post #7 of 16 (permalink) Old 10-12-2017, 03:11 PM
Seasoned PostWhore
 
S4gunn's Avatar
 
Join Date: Dec 2010
Location: SF, CA
Age: 41
Posts: 2,611
Garage
Quote:
Originally Posted by Natesriv View Post
I'll have my mechanic change it then. Save me the hassle.
This is another super easy job.
The bolts are all obvious. and you just need to put the rear end on jackstands and support the rear pumpkin while you unbolt the rear support (jack is fine).
-g

My TCCOA iTrader Rating: (44 / 100% w/ 50+ transactions)

24 Hours of Lemons 2017 Sear Pointless Organizer's Choice
2018 Upgrade: does your TBIRD make Fritos? Mine does
http://goo.gl/csaet4
S4gunn is offline  
post #8 of 16 (permalink) Old 10-12-2017, 07:54 PM
Kind of slapped together
 
Join Date: Jan 2010
Location: Bossier City, LA
Age: 63
Posts: 4,838
Quote:
Originally Posted by S4gunn View Post
This is another super easy job.
The bolts are all obvious. and you just need to put the rear end on jackstands and support the rear pumpkin while you unbolt the rear support (jack is fine).
-g
Oh, and don't support the rear end by the wheels; they should be free hanging. You can use a jackstand under the lower control arm, though.

RwP

Fuelly
RalphP is offline  
post #9 of 16 (permalink) Old 10-12-2017, 07:58 PM
4th Gear Poster
 
Kenz's Avatar
 
Join Date: Oct 2014
Location: SYR, NY
Posts: 323
Not trying to be negative, but I doubt a fluid change is going to fix a noise like you describe. Unless the fluid is low or somehow has water in it; the original diff fluid should last well over 100,000 miles in an open diff. It is always good to get fresh fluid, but without the trac loc clutches it's not something that has to be changed often. If your Tbird has always made this noise, it could well be just how the gears mesh in your differential.

I know you said you are sure it's your diff, but it's not uncommon for our transmissions to make a little noise like you described, at low speeds.

96 Cougar Sport - T45 Swapped
Kenz is offline  
post #10 of 16 (permalink) Old 10-13-2017, 08:01 AM Thread Starter
6th Gear Poster
 
Natesriv's Avatar
 
Join Date: Dec 2016
Location: Kansas City
Age: 49
Posts: 584
Garage
Quote:
Originally Posted by Kenz View Post
Not trying to be negative, but I doubt a fluid change is going to fix a noise like you describe. Unless the fluid is low or somehow has water in it; the original diff fluid should last well over 100,000 miles in an open diff. It is always good to get fresh fluid, but without the trac loc clutches it's not something that has to be changed often. If your Tbird has always made this noise, it could well be just how the gears mesh in your differential.

I know you said you are sure it's your diff, but it's not uncommon for our transmissions to make a little noise like you described, at low speeds.
Could be that as well. I'll put in neutral see if coasting does it too. Tranny is getting another look next week and I bought new filter and fluids (Mercon-v) and gasket. I'll have them take it off again as there's no reason a tranny should jolt like that. I see no vacuum leaks (holds 50 psi at idle and throttle), or misfires...rear diff has new carrier bushings as well...poly.

I'm wondering if an OD band is worn, or they didn't replace it... Perhaps the car is slipping in and out of lock in OD while coasting and that jolt is it re-engaging. I don't know enough about AOD's to really know for sure though.

Where do you add fluid to rear diff? is there a bolt in the rear cover to add once it's put back on? I thought the rear pumpkin cover had several things attached to it...
Like this?

God created Arakis to train the faithful... One cannot go against the word of God.........

Last edited by Natesriv; 10-13-2017 at 08:06 AM.
Natesriv is offline  
post #11 of 16 (permalink) Old 10-13-2017, 08:03 AM Thread Starter
6th Gear Poster
 
Natesriv's Avatar
 
Join Date: Dec 2016
Location: Kansas City
Age: 49
Posts: 584
Garage
which gasket do you suggest?
https://www.rockauto.com/en/catalog/...l+gasket,13411

God created Arakis to train the faithful... One cannot go against the word of God.........
Natesriv is offline  
post #12 of 16 (permalink) Old 10-13-2017, 08:36 AM
Kind of slapped together
 
Join Date: Jan 2010
Location: Bossier City, LA
Age: 63
Posts: 4,838
I circled the fill plug.

I stick with a name brand; but a lot of people just build a RTV style form-a-gasket on the diff cover.

Might want to consider a "better" diff cover (possibly a finned one for better heat dissipation); but it has to be one for a IRS, so best choice is to check SuperCoupePerformance or SpinningWheels.

Edit: Oh, and that bolt holding it to the rear mount is loose; GET IT TIGHTENED UP SOONEST!

RwP
Attached Images
File Type: jpg LPW 201-8.8IRS installed.jpg (321.1 KB, 5 views)

Fuelly
RalphP is offline  
post #13 of 16 (permalink) Old 10-13-2017, 09:25 AM Thread Starter
6th Gear Poster
 
Natesriv's Avatar
 
Join Date: Dec 2016
Location: Kansas City
Age: 49
Posts: 584
Garage
Not my car, image found on internet

what about the lower left bolt there? Is that a drain?

God created Arakis to train the faithful... One cannot go against the word of God.........
Natesriv is offline  
post #14 of 16 (permalink) Old 10-13-2017, 09:45 AM
MA Chapter Director

Administrator
 
Rodeo Joe's Avatar
 
Join Date: Jul 2002
Location: Franklin, MA
Age: 62
Posts: 7,930
Garage
That's what it looks like. BTW that's not an OEM cover.

Joe

It's not a 97 Sport, it just looks like one!

Mass. TCCoAers, Send me your info!

I buy all my Ford parts from 93 lx.

Member of the TCCoA Damage Control Team.

R.I.P. Johnny Langton 1975 - 2011
Rodeo Joe is offline  
post #15 of 16 (permalink) Old 10-13-2017, 10:44 AM Thread Starter
6th Gear Poster
 
Natesriv's Avatar
 
Join Date: Dec 2016
Location: Kansas City
Age: 49
Posts: 584
Garage
I'll have to look tonight when I get home.

God created Arakis to train the faithful... One cannot go against the word of God.........
Natesriv is offline  
post #16 of 16 (permalink) Old 10-13-2017, 10:44 AM
Kind of slapped together
 
Join Date: Jan 2010
Location: Bossier City, LA
Age: 63
Posts: 4,838
Quote:
Originally Posted by Natesriv View Post
Not my car, image found on internet

what about the lower left bolt there? Is that a drain?
It is; but there isn't one on my diff cover, nor on the cover on my "spare" 2.73 TL diff (planning to get it rebuilt with the 3.55 gears onna deze daze)

RwP

Fuelly
RalphP is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the TCCoA Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
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:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome