rear end widths? - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 31 Old 03-14-2009, 05:45 AM Thread Starter
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Question rear end widths?

how much wider is a sn-95 rear end housing than a fox from edge of bearing retainers? not with the axles i know those add .75" per side.

or is it the later cars 99- 04 that have the wider housing? either way what rears are wider than the fox's, and by how much per side?


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post #2 of 31 Old 03-14-2009, 07:12 AM
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Well, Between, the TBird, Fox, SN95 and Lincoln Mark VII rears that I've measured, the housings are all the same width.

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post #3 of 31 Old 03-14-2009, 09:33 AM
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The Mustang 8.8" rear end housing is the same from '86-'98. The '99-'04 housing is wider.

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post #4 of 31 Old 03-14-2009, 10:17 AM
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Quote:
Originally Posted by 85GTVince View Post
The Mustang 8.8" rear end housing is the same from '86-'98. The '99-'04 housing is wider.

--Vince
This is correct.
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post #5 of 31 Old 03-14-2009, 11:53 AM Thread Starter
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Quote:
Originally Posted by 85GTVince View Post
The Mustang 8.8" rear end housing is the same from '86-'98. The '99-'04 housing is wider.

--Vince
ok yea this is what i thought, so how much wider per side?

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post #6 of 31 Old 03-14-2009, 12:23 PM
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1.5 inches per side, 3 inches total.
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post #7 of 31 Old 03-14-2009, 12:38 PM Thread Starter
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Quote:
Originally Posted by MFE View Post
1.5 inches per side, 3 inches total.
ok cool, so would this mean it is 3" wider total than a fox rear with sn-95 axles?? i mean the point of the added .75" of the sn-95 axles was for disc brakes, and the stock fox axles were shorter because it came with drums right?

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post #8 of 31 Old 03-14-2009, 03:27 PM
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The extra .75 axle length on SN95's is to accomodate the ABS rings but the housing stayed the same length. So a 99-03 housing is 3 inches wider than a 86-98 housing, and the track width is 3 inches wider than 86-93's and 1.5 inches wider than 94-98's.
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post #9 of 31 Old 03-15-2009, 06:00 AM Thread Starter
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Exclamation

Quote:
Originally Posted by MFE View Post
The extra .75 axle length on SN95's is to accomodate the ABS rings but the housing stayed the same length. So a 99-03 housing is 3 inches wider than a 86-98 housing, and the track width is 3 inches wider than 86-93's and 1.5 inches wider than 94-98's.
so if im running a fox rear with sn95 axles(+.75" each side) which is 1.5" wider total. add .75" in spacers more per side which would be 1.50" total each side and 3" total overall.

this would be the same as having 99-03 rear with 99-03 axles and no spacers, along with the housing being 1.5" wider per side closing the gap the sn95 axles made on fox housing.?

basically a 3" wider version of stock width fox rear? no gap like on a 98 housing?

i ask this because i think in order to use GR 4 on 4 rear brakes in a fox you need to have stock fox length 5 lug axles not sn95 axles.? this would create a situation where i would need 1.5" spacers on each side to get the wheel where i have it now-- which is too much spacer, therefore wanting the 99 rear with no spacers.

this is hard to explain in txt, am i getting my idea across?
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post #10 of 31 Old 03-15-2009, 11:00 AM
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If you want to use an '86-'98 housing and have the same track width as a '99-'04 then you would need '94-'98 axles and .75" spacers (per side). The '99-'04 rear end assembly is ~3" wider (total) than the Fox rear end assembly.

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Last edited by 85GTVince; 03-15-2009 at 02:55 PM. Reason: Corrected wrong information per the info from Toys.
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post #11 of 31 Old 03-15-2009, 11:31 AM
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Quote:
Originally Posted by MFE View Post
1.5 inches per side, 3 inches total.
When I went from a 98 to 99 housing my track grew a little over an 1 1/2". I measured both axles on the ground but I've forgotten those measurements. I'm ASSuming your including the extra length in the axles too?

Quote:
The extra .75 axle length on SN95's is to accomodate the ABS rings but the housing stayed the same length. So a 99-03 housing is 3 inches wider than a 86-98 housing, and the track width is 3 inches wider than 86-93's and 1.5 inches wider than 94-98's.
Sorry, missed this.
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post #12 of 31 Old 03-15-2009, 11:35 AM
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Quote:
Originally Posted by 2ndsideways View Post
how much wider is a sn-95 rear end housing than a fox from edge of bearing retainers? not with the axles i know those add .75" per side.

or is it the later cars 99- 04 that have the wider housing? either way what rears are wider than the fox's, and by how much per side?
To answer you question about housing width per Ford Engineering prints:

Overall Width (edit -- HOUSING)
94-98 -- 56.198" - 56.094"
99-04 -- 57.616" - 57.512"

Brake Flange Mounting Surface
94-98 -- 54.10"
99-04 -- 55.51"

1.41" difference, 0.705" added each end to move the bearings out to support the longer axles.

This is housing width as you orginally asked for, not axle flange to axle flange. Not sure where this 3" stuff is coming from but it's not in the housing as a few have stated. I think a few switched gears and started talking about flange to flange.

I can also tell you that the 93 and prior 8.8 Mustang/T-Bird housing match the 94-98 dimensions. I have a T-Bird housing on my bench now for a project which is why I have most of this data at my fingertips.

I'm actually trying to find a housing longer than the 99+ housing but with the NVH damper mounting pads cast into the center section like the Mustang which is how the MM torque are mounts. I need the extra housing length to aid in building a full floater. Going to start pulling Lincoln and Crown Vic prints next. The S197 housing is perfect but doesn't have the flanges needed to mount a TA. Would work great for custom 3-link!

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Last edited by Toys; 03-28-2009 at 07:02 PM. Reason: add floater comment
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post #13 of 31 Old 03-24-2009, 10:02 PM
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so could someone tell me the length of a stock foxbody rear, outside of axle flange to outside of axle flange?

'99 Mustang
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post #14 of 31 Old 03-25-2009, 05:43 PM
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That is too easy.

Take each axle, 29.16", multiply by two, 58.32". Add the diameter of the differential pin, 0.75". You get 59.07" from axle flange to axle flange, WITH a new tight clutch pack. As the clutches wear, the number will get slightly larger. That is one of the reasons that Toys widths above, have a range.

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post #15 of 31 Old 03-25-2009, 08:00 PM
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Thanks!

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post #16 of 31 Old 03-28-2009, 04:19 PM
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98-99

so a 94-98 rear end and 99 up are the same width? Only difference is the housing was extended outwards to support the longer axles? (alot of numbers alittle confused) ( edit: I guess it would be axle flange to axle flangr is the same?)

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Last edited by 91 ELEX; 03-28-2009 at 04:28 PM.
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post #17 of 31 Old 03-28-2009, 04:33 PM
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No. Look at the measurements that TOYS posted.

Make a drawing on a piece of paper to see this. The 99+ axles must be longer or his measurements are not possible.

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post #18 of 31 Old 03-28-2009, 06:46 PM
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so after lengthening the housing the axles were done the same, im geussing to accomodate the ABS rings?

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post #19 of 31 Old 03-28-2009, 07:03 PM
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Guys, just to be clear...., the measurements I quoted are for a bare housing, no axles. The orginal question was about the housing.

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post #20 of 31 Old 03-28-2009, 07:06 PM
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I never can figure why this is so hard to understand.

Model...Axle version...Housing version
.Fox....A...1
.SN95..B...1
99-04..C...2

The axle lengths get longer with each model change. The housing lengths only changed between the SN95 and the 99-04.

You can put SN95 axles in a foxbody housing. You can put Fox axles in an SN95 housing. You can NOT put either Fox or SN95 axles in a 99-04 housing, nor can you put 99-04 axles in a Fox housing. You might be able to get away with 99-04 axles in an SN95 housing, not sure.
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post #21 of 31 Old 03-28-2009, 08:03 PM
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all clear new

Thanks for clearing that up. The reason i ask is im going to do a five lug conversion and plan on using 99-04 spindels. To my understanding this will increase wheel track by 1/3" on each side and i would like to find the best match for this.

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post #22 of 31 Old 03-29-2009, 08:31 AM
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So, everyone with sn cars always complain about the rear wheels sitting in tofar. What if you took a 99 model 8.8 and installed it in a 95. This is my dilemma right now. I have a 95 with 17x8 cobra wheels that looks awful with the wheels way in. Or just add spacers.
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post #23 of 31 Old 03-29-2009, 08:47 AM
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Quote:
Originally Posted by MJ86GT View Post
So, everyone with sn cars always complain about the rear wheels sitting in tofar. What if you took a 99 model 8.8 and installed it in a 95. This is my dilemma right now. I have a 95 with 17x8 cobra wheels that looks awful with the wheels way in. Or just add spacers.
This is what I did, these are not the best pics but you get the idea.


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post #24 of 31 Old 04-19-2017, 12:31 AM
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Will 1995 mustang Cobra rear end fit under a 1967 mustang Fastback
Thank you Kerry
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post #25 of 31 Old 04-19-2017, 10:25 AM
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Quote:
Originally Posted by 2ndsideways View Post
so if im running a fox rear with sn95 axles(+.75" each side) which is 1.5" wider total. add .75" in spacers more per side which would be 1.50" total each side and 3" total overall.

this would be the same as having 99-03 rear with 99-03 axles and no spacers, along with the housing being 1.5" wider per side closing the gap the sn95 axles made on fox housing.?

basically a 3" wider version of stock width fox rear? no gap like on a 98 housing?

i ask this because i think in order to use GR 4 on 4 rear brakes in a fox you need to have stock fox length 5 lug axles not sn95 axles.? this would create a situation where i would need 1.5" spacers on each side to get the wheel where i have it now-- which is too much spacer, therefore wanting the 99 rear with no spacers.

this is hard to explain in txt, am i getting my idea across?

I like where your head is it, im running 1/2 spacers, and always thought about running the newer rear ends on top of the 1.2 inch spacer. We can also run zero offset wheels....

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post #26 of 31 Old 05-05-2017, 11:47 AM
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So this winter im planning on finding a 99-04 rearend, throw 3.55s in it, ARP extended studs, MM 1/2 inch wheel spacers, which puts me 2 inches wider than a fox and 1.25 inches wider than i am currently at, on each side.

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post #27 of 31 Old 02-25-2018, 06:14 PM
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will the 99-04 rear end bolt into a fox using existing suspension???

will the 99-04 rear end bolt into a fox using existing suspension???

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post #28 of 31 Old 02-25-2018, 06:24 PM
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No.

The 1999-2004 housing uses M14 bolts for the RLCAs.

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post #29 of 31 Old 02-26-2018, 08:42 AM
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Sooo... New bushings (with the bigger bushing sleeves) in the axle end of the RLCAs and you're good to go? (Assuming, of course, that you have RLCAs that have bushings that can be replaced.)

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post #30 of 31 Old 02-26-2018, 02:02 PM
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Yes.

You will also have to use rear brake lines from a 1987-1995 8.8" differential housing.

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post #31 of 31 Old 03-05-2018, 01:51 PM
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Question

I want to add rear discs to my Fox. Is an '94-'98 rear end the best with welded tubes, 11.65" brake rotors, 31 spline axles in mind?
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