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Thread: Deciphering Fox Axels

  1. #11
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    Jim, you're making my head hurt....

    Using the 29-5/32" Ranger axles in the shorter housing gives the same overall width as the Fox Mustangs... 59.5" .... in 5-lug. I have no idea what the length of the other side Ranger axle is....The 29-5/32" dimension is from the splined end to the faqce of the lug flange..... add .75" to that and you're at approx 29.9"....which is the Tbird/SN-95 axle length.

    The Mk7 axles will be .75" + .50" = 1.25" longer than the Fox Mustang axles... Your early Mk7 axle housing is the same width as the Mustang housings...so yes...the longer axles fit in the same housing, even though the resulting overall width is 2.5" wider.
    Last edited by Chuck W; 04-22-2008 at 07:56 AM.
    Long live the 4-eyes! - '83 Tbird Turbo

  2. #12
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    I threw the info into a spreadsheet to make it more manageable.
    I might have gotten all the information correct, I might not have...


    Axle Spreadsheet

    updated 18:30 5/19/08
    Last edited by JeremyB; 05-19-2008 at 06:36 PM.

  3. #13
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    Quote Originally Posted by JeremyB View Post
    I threw the info into a spreadsheet to make it more manageble.
    I might have gotten all the information correct, I might not have...


    Axle Spreadsheet
    Looks right to me. Glad to see the 99-04 stuff in there too.

    I know Jim has an 84 Mk7 axle, which will be the same as my 84 SVO rear I have in the '80 XR-7.

    There will probably be more than one Mk7 variation.

    Thanks for organizing it better.
    Long live the 4-eyes! - '83 Tbird Turbo

  4. #14
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    Quote Originally Posted by Chuck W View Post
    Jim, you're making my head hurt....

    lol Chuck!, my Dad's been telling me that exact same thing for over 40 years!
    If it helps at all let me say I really do appreciate your help and humoring me. Of all the people on this site this would be WAY harder without your help. Seems to all be obvious to you, however confusing for me.

    Jeremy, Wow that looks great Thanks!

    First the comparison of the two, I think I said 2” difference, I was mistaken a bit.. here they are standing side by side


    1990 Mustang Axel
    Overall 29-1/4
    Tip <-->beginning of machined surface (race) 26-1/4
    Tip <-->ending of machined surface (seal) 27-3/4


    1984 Mark VII Axel
    Overall 30-1/2
    Tip <-->beginning of machined surface (race) 26-1/4
    Tip <-->ending of machined surface (seal) 27-3/4


    Differance is more like 1-1/4

    Also
    The bearing Begins .750 into the end of the housing
    The Backing plate Flange is 1” in from the actual end of the housing (outer edge of the seal)
    The bearing is .625 wide

    I will draw this bering area up tomorrow at work to better illustrate it, right now it’s late and I need to get sleep.
    Objects In Mirror Appear to be Loosing

  5. #15
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    Compairing to Jeremy's info from a ford document (pretty reliable source!)
    It's saying the mustang axels I measured at Overall 29-1/4 (29.250) are actualy 29.180
    I would be measuring .070 longer i think the Keeper grouve and end are much larger than .070 so I'm going to assume my measurment with the tape measure if OFF

    you can bet my Mark VII measurment is off about the same.

    I have a 0-18" calaper at work but nothing to measure 30" any more accurate than what I have.
    Objects In Mirror Appear to be Loosing

  6. #16
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    Quote Originally Posted by Jim_Miller View Post

    Differance is more like 1-1/4
    That's what I said above.....
    Long live the 4-eyes! - '83 Tbird Turbo

  7. #17
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    Quote Originally Posted by Chuck W View Post
    That's what I said above.....
    You sure did.
    Have never once doubted anything you have said.
    Objects In Mirror Appear to be Loosing

  8. #18
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    Excellent information Jim. I've added it to the spreadsheet.

  9. #19
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    I've succeeded at installing an 88 XR7 8.8 inch drum rear end onto my 87 TBird Sport. New quad shocks and diff bushings certainly tightened things up too. Before the install, I measured A = 61 and B = 55.596 as an addition to your spreadsheet. Good spreadsheet. It would be nice to have more of these inter-fox comparison charts developed for our TBird/Cougar modifying obsession (err... I mean hobby).
    87 Sport with HO cam, 19# injectors,TB+Upper Intake,87 Mustang EEC, Cloyes double roller timing chain, Kirban adj. fuel regulator and Autometer fuel pres. guage, HO shorty headers + LSC H-pipe and Dynomax Super Turbo Mufflers, Ford Racing 9mm wires, K&N filter / no air resonator, 8.8 XR7 Diff., V rated tires, Project ongoing.

  10. #20
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    Dunno if this pertains to any info being gathered here, but...I was reading the June '07 Car Craft, and they have an article about 8.8" rears. I noticed they mention that starting in '94 mustangs they had 31 spline axles and carrier. I thought the 31 spline axles were in trucks only? Hmm, could Car Craft have made a boo-boo?
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