• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech

Is the factor weight on the rear diff necessary?

  • Thread starter Thread starter pissedoff92
  • Start date Start date Mar 30, 2012
  • 1
  • 2
Next
1 of 2 Next Last

pissedoff92

Member
Aug 14, 2011
288
7
18
western new york
Mar 30, 2012
#1
  • Mar 30, 2012
  • #1
I'm rebuilding a rear end for my car and I want to install the upr axle tube braces but the picture looks as though you use the holes where the factory weight bolts. Is the weight a necessity? or is it safe to remove it. The whole reason im even building a rear end is because I blew the axle tube out of the centersection on the original rear end. so the braces are sort of added insurance
 

Gearbanger 101

Straight Outta Locash
20+ Year Stangneter
Aug 10, 2002
9,457
1,377
234
Ontario, Canada
Mar 30, 2012
#2
  • Mar 30, 2012
  • #2
If you're talking about the rear "dog bone" that bolts to the diff, then it will depend if you've changed out the stock gears when you did the rear end or not. The weight was designed to dampen vibration in the driveline. Swapping out to higher numeric gearing makes it next to useless anyway, so unless you're picking up any vibration in the dirveline, feel free to leave it off.
 

jrichker

StangNet's favorite TOOL
In Remembrance. Thank you for your contributions
Mar 10, 2000
27,512
2,813
234
Dublin GA
Mar 30, 2012
#3
  • Mar 30, 2012
  • #3
The answer is: it cost Ford money to put it on there. If they could have figured a way to leave it off and save a buck, they would have done it. Sometimes you can take it off and if everything is balanced just right, it won't be noticeable. If not you'll feel a tingling sensation in the shifter and the seat of your pants...
 

Shakerhood

20+ Year Stangneter
Oct 28, 2004
3,356
208
114
Ohio
Mar 31, 2012
#4
  • Mar 31, 2012
  • #4
Gearbanger 101 said:
If you're talking about the rear "dog bone" that bolts to the diff, then it will depend if you've changed out the stock gears when you did the rear end or not. The weight was designed to dampen vibration in the driveline. Swapping out to higher numeric gearing makes it next to useless anyway, so unless you're picking up any vibration in the dirveline, feel free to leave it off.
Click to expand...

I believe that is an old internet myth, the part number for the dogbone covers a wide range of gear sets.
 

Gearbanger 101

Straight Outta Locash
20+ Year Stangneter
Aug 10, 2002
9,457
1,377
234
Ontario, Canada
Mar 31, 2012
#5
  • Mar 31, 2012
  • #5
Shakerhood said:
I believe that is an old internet myth, the part number for the dogbone covers a wide range of gear sets.
Click to expand...
Agreed...but the fact remains that the weight is there, to dampen vibrations created by the driveline. With higher numeric gear sets, comes faster driveshaft speeds. With faster driveshaft speeds, comes increased driveline vibration...which at some point makes the dog bone a useless pile of metal and forces the owner to concentrate on balancing the components themselves....not masking them with a heavy steel damper.
 

Blandnuts

I don't swallow; I only swoosh
Founding Member
Aug 21, 2000
1,172
124
124
FloorDuh
Mar 31, 2012
#6
  • Mar 31, 2012
  • #6
At what point does it become "a useless pile of metal"? Do you have data that shows this? Like, the increase in vibration for different gear sets.
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,218
17,901
224
Massachusetts
Mar 31, 2012
#7
  • Mar 31, 2012
  • #7
After rebuilding my diff and painting it, I chose to leave it off.

I still have it. If I feel any vibration I'll put it back, but do far so good


Sent from my iPhone 4S using Tapatalk
 

Gearbanger 101

Straight Outta Locash
20+ Year Stangneter
Aug 10, 2002
9,457
1,377
234
Ontario, Canada
Mar 31, 2012
#8
  • Mar 31, 2012
  • #8
Blandnuts said:
At what point does it become "a useless pile of metal"? Do you have data that shows this? Like, the increase in vibration for different gear sets.
Click to expand...
Have you any data to disprove my point? It's not rocket science. The faster you spin a driveshaft, the more out of whack it becomes. Higher numeric gear sets, increase driveshaft speed. This is a fact. Consider how "thrown together" our Fox's are, along with the spongy rubber isolators and bushings that separate our drive train components and it's no wonder that almost every Fox I’ve ever been in is plagued with driveline vibration. Fords answer....well, a well built and balanced driveline and suspension would drive the overall cost of the vehicle up and hurt sales, so....band aid the issue with a big, heavy weight on the pinion to absorb vibration and call it "good enough".
I'm not saying removing it makes the problem go away any point. I'm saying that at some point, that band aid won't address the problem any longer and one should look into other area's to correct the issue.
 

stang&2Birds

Founding Member
May 4, 2000
2,091
5
58
New England. :-) CT/MA
Mar 31, 2012
#9
  • Mar 31, 2012
  • #9
Gearbanger 101 said:
bla, bla, bla
Click to expand...

IMHO, people ignore anything other than:
"THE FOLLOWING RICER MOD WILL GAIN YOU 500HP, 200MPG, AND REDUCE YOUR QTR MILE TIME BY 20SECONDS".

Fact of life.


WARNING!
DO NOT READ THE FOLLOWING ARTICLE! IT WILL FRY YOUR BRAIN!
DO NOT SPEND 15 MINS TO READ AND UNDERSTAND THE FOLLOWING ARTICLE!!!
INSTEAD, SPEND 20+ HOURS ARGUING PURE AND TOTAL BS ON THE FORUMS!
YOU HAVE BEEN WARNED!
http://www.tccoa.com/articles/tranny/transmission/page17.shtml
 

Gearbanger 101

Straight Outta Locash
20+ Year Stangneter
Aug 10, 2002
9,457
1,377
234
Ontario, Canada
Mar 31, 2012
#10
  • Mar 31, 2012
  • #10
stang&2Birds said:
YOU HAVE BEEN WARNED!
http://www.tccoa.com/articles/tranny/transmission/page17.shtml
Click to expand...
You do realize that this article just proved my point and backed up everything I said, right?
 

stang&2Birds

Founding Member
May 4, 2000
2,091
5
58
New England. :-) CT/MA
Mar 31, 2012
#11
  • Mar 31, 2012
  • #11
Gearbanger 101 said:
You do realize that this article just proved my point and backed up everything I said, right?
Click to expand...

I was nice and edited out most of my initial reply.
I thought that I left enough to make my view obvious. Clearly, I didn't.

Here's part of my orig post:
=========
So, yes, remove the cost adding and weight adding part on your LOW COST Mustang! IGNORE that the Fox Mustang was made to be LOW COST, with 4-lugs to REDUCE COST and weight, etc.

Yup, the Ford Engineers are clueless idiots.
=========
 

stang&2Birds

Founding Member
May 4, 2000
2,091
5
58
New England. :-) CT/MA
Mar 31, 2012
#12
  • Mar 31, 2012
  • #12
BTW, no easy way to cut and paste from the tccoa.com ******ing flash-based article.
I did try to cut out the paragraph that directly addresses the "mooseballs".
 

Gearbanger 101

Straight Outta Locash
20+ Year Stangneter
Aug 10, 2002
9,457
1,377
234
Ontario, Canada
Mar 31, 2012
#13
  • Mar 31, 2012
  • #13
stang&2Birds said:
I was nice and edited out most of my initial reply.
I thought that I left enough to make my view obvious. Clearly, I didn't.

Here's part of my orig post:
=========
So, yes, remove the cost adding and weight adding part on your LOW COST Mustang! IGNORE that the Fox Mustang was made to be LOW COST, with 4-lugs to REDUCE COST and weight, etc.

Yup, the Ford Engineers are clueless idiots.
=========
Click to expand...


You could have left it in if you'd liked. It's not a whole lot different than what I said. If there aren't any vibration issues with it off, then leave it off. As I stated, and you confirmed these cars were put together with spit and bubble gum. If he's swapping out to higher numerically gears, then the driveshaft speed increases, as does drive train resonance and vibration. A better way of controlling vibration would be to address the rest of the drive train (IE the driveshaft). If you'll check my post recent post history, you'll see that I'm currently in the process of fixing driveline vibration issues of my own.....with an aluminum driveshaft...just as it's suggested in the article.

http://www.stangnet.com/mustang-for...star-aluminum-driveshaft.854763/#post-8599851

I really don't see the argument here?
 

Gearbanger 101

Straight Outta Locash
20+ Year Stangneter
Aug 10, 2002
9,457
1,377
234
Ontario, Canada
Mar 31, 2012
#14
  • Mar 31, 2012
  • #14
stang&2Birds said:
I did try to cut out the paragraph that directly addresses the "mooseballs".
Click to expand...
Interesting terminology for it.
 

stang&2Birds

Founding Member
May 4, 2000
2,091
5
58
New England. :-) CT/MA
Mar 31, 2012
#15
  • Mar 31, 2012
  • #15
Gearbanger 101 said:
I really don't see the argument here?
Click to expand...
I agree with you.
But, more so, I think that people should leave it on - unless they have a 100% pure quarter-mile car (weight is more important at that point).

Just because people "don't feel or hear a problem", does not mean that there isn't a problem.

However, at the same time, we are not talking about people using a Fox as a daily driver driving 15K miles a year.

Considering how many miles really drive their Fox Stangs, and the age of the components anyway, it likely won't make any real difference. Heck, if the u-joints go, who can really say if it's from the beat-up body/components, or if it's because someone removed the rear-axle damper?
IMHO, people can leave the axle damper on, or take it off.

However, if people really want to know what it does, and why it's there, then I care that people get the correct information. IMHO, after that, it's up to each individual to decide what to do with their car.



Gearbanger 101 said:
Interesting terminology for it.
Click to expand...
That was the common term used for the axle damper back in the 90's.
 
M

Mary brown

Banned
Feb 7, 2012
17
0
13
Mar 31, 2012
#16
  • Mar 31, 2012
  • #16
a great site,many useful information!

 

stykthyn

I want to measure mine. It doesn't look that tall.
15 Year Member
Jul 6, 2006
5,232
2,652
223
gainesville
Apr 1, 2012
#17
  • Apr 1, 2012
  • #17
Fwiw when I swapped rear ends the new unit didn't have the weight and I haven't noticed any real difference. Not saying a vibration isn't there but I can't feel it.
 

pissedoff92

Member
Aug 14, 2011
288
7
18
western new york
Apr 1, 2012
#18
  • Apr 1, 2012
  • #18
gearbanger yes I am throwing in frpp 4.10's thanks for the answers and debate haha
 

Blandnuts

I don't swallow; I only swoosh
Founding Member
Aug 21, 2000
1,172
124
124
FloorDuh
Apr 1, 2012
#19
  • Apr 1, 2012
  • #19
Gearbanger 101 said:
Have you any data to disprove my point?
Click to expand...

Hey buddy, don't get your panties in a wad. You stated facts and I asked for the data. Thought you might of had some data that would of been beneficial to other members...guess not.
 

Gearbanger 101

Straight Outta Locash
20+ Year Stangneter
Aug 10, 2002
9,457
1,377
234
Ontario, Canada
Apr 1, 2012
#20
  • Apr 1, 2012
  • #20
My panties are not in a wad. You sounded as thought you were trying to be condescending in your post. If you’re saying that wasn’t your intention, then I apologize. As for the data. Grab a hold of your shifter at highway speeds, and feel for yourself. If it shakes your fillings loose, or you can't make out objects in your rear view mirror, and the rest of your driveline components are in good shape, then there's a good bet that the "dog bone" is no longer doing it's job....take a look at the article Stang&2Birds posted above. That will contain all of the data and formula for calculating your own critical driveshaft RPM and what should be done to control it that you should need.
 
  • 1
  • 2
Next
1 of 2 Next Last
You must log in or register to reply here.

Similar threads

New Products From J&M Products - 1979-1998 & 1999-2004 Race/Extreme Duty Rear Lower Control Arms
  • J&M Products
  • Oct 9, 2025
  • Vendor Sponsor Forums
Replies
0
Views
249
Vendor Sponsor Forums Oct 9, 2025
J&M Products
What's your tow rig?
  • LILCBRA
  • May 31, 2026
  • Other Auto Tech
Replies
3
Views
92
Other Auto Tech May 31, 2026
LILCBRA
R
What's it Worth? 1997 Cobra, a ton of mods and restoration
  • riored97snake
  • Jun 18, 2026
  • What is it Worth?!?!?
Replies
2
Views
86
What is it Worth?!?!? Jun 21, 2026
riored97snake
R
6
Hey all,I’m putting together a 302 for my 1968 Mustang and wanted to post the combo + some questions to make sure I’m not missing crucial
  • 68_Disgustang
  • Feb 22, 2026
  • 1965 - 1973 Classic Mustangs -General/Talk-
Replies
4
Views
760
1965 - 1973 Classic Mustangs -General/Talk- Jun 20, 2026
gray owl
G
Progress Thread 88 Notched Fox
  • NotchedGarage
  • Jul 15, 2023
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
12
Views
2K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jun 21, 2024
Flyboy60
F
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?