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Thread: Help! 7.5" Axle to 8.8" Trouble!

  1. #61
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    I just have to say, that chart and it's contents are beautiful!
    1988 Thunderbird Turbo Coupe
    '89 5.0 w/ ported intakes, Mallory Adjustable FPR, BBK shorties and H with 2.5" Flows, 130 amp 3G, 89 Mustang comp/wiring, Aluminum radiator w/ elec fan, T5 trans, King Cobra clutch, 3.55 gears, 13" Cobra brakes (front), Wilwood prop valve, Mustang A-arms, Front Coil-overs, MM CC plates, Silver 17x9 R's, 03 Cobra IRS, Aluminum DS, 2002 Mustang dash/console etc..., custom leather seats

  2. #62
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    Just an idea.
    What about swapping the tubes?
    No bracket or length problems.
    Ask around, someone where you live should be able to swap the tubes and maybe even square them up and weld them in place...
    I have acquired an 8.8 differential with a powertrax posi unit. My issue comes from the fact that the axles are 5 lug and am using 4 lug rims which I do not want to replace just yet.

  3. #63
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    Quote Originally Posted by Its1FastCat View Post
    Just an idea.
    What about swapping the tubes?
    No bracket or length problems.
    Ask around, someone where you live should be able to swap the tubes and maybe even square them up and weld them in place...
    I have acquired an 8.8 differential with a powertrax posi unit. My issue comes from the fact that the axles are 5 lug and am using 4 lug rims which I do not want to replace just yet.
    Or how about just picking up a set of axles from an 83-85 TBird/Cougar, or from an 87-88TC?

    What is your 8.8 out of?
    Long live the 4-eyes! - '83 Tbird Turbo

  4. #64
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    Good looking chart! Would it be possible to update it with axle spline count unless they are all 28's and are Mark VII 7.5" ring gears?
    88 t-bird: 5.0ho, gt40y, crane 2031, fms 1.7, paxton@5#, aod wide ratio, tci stall, performer rpm upper, 70mm bbk, pro m 60, 42#s, 3.73 7.5" posi, jba shorties, borla, upr x. 13.4 @ 104mph. cbaza, moates, tuned by decipha

  5. #65
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    So does anyone know the width of the housing in an 84'-92' Mark VII? Im going from a Fox Mustang 8.8 drum rear to Mark VII axles, rotors, calipers, ect. Im looking for the 5 Lug vented rotor and the extra width. Just want to make sure its going to be a bit wider then an 87'-88' Turbo Coupe rear end.

  6. #66
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    Quote Originally Posted by turborscapri1984 View Post
    So does anyone know the width of the housing in an 84'-92' Mark VII? Im going from a Fox Mustang 8.8 drum rear to Mark VII axles, rotors, calipers, ect. Im looking for the 5 Lug vented rotor and the extra width. Just want to make sure its going to be a bit wider then an 87'-88' Turbo Coupe rear end.
    When or if it ever quits raining ,I can go out and measure it for ya.I have a 90 model linc mk 7 with disc brakes.I did a quick measure last night and went from outside to outside of the flanges and got 54 inches.the 88 cougar xr7 rear end is 56 in ches from flange to flange.both are 8.8s and both are disc brakes.I used the 94 mustang axle and it has 2in of splines and the linc has 1 1/2 splines.the linc axle is 30-1/2 and the mustang (sn95-94 and up)is 30 inches.I slid both in the 54 in housing from the linc and the both went in fine.I didnt get any farther(Rain).I will get some pics tomorrow(I hope-I swear were in seattle ,wa).I am doing the same set up the way it sounds as you but,I am putting mine in a malibu.i hope that some of this helps.I am doing a write up on maliburacing.com about 8.8 backyard build up with pics.you can go on there and check it out.kenny

  7. #67
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    I put an 8.8 under my bird from a 91 lx with 2.73 trac lok and i ordered 1 1/4 wheel spacers from ezaccesories.com for like 84 bucks shipped. the only problem is they come with 12mm studs and lugs. And the only problem i ran into with the rear was the fact i have air shocks the kicker shocks would have came into contact with them. Also if you go the mustang route get the brackets to bolt the kicker shocks on from the doner car. your gonna need them and there bolts for the frame( some special bolts). Unless your not worried about the kickers like i wasnt. and it only took me about an 1 1/2 to swap rears and get her back on the road. Just what ever you do dont weld the diff in the 7.5 and try driving on the street i did and nothing but bad things happened=] but any other questions let me know

  8. #68
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    the marks rear is an inch wider on each side then a 7.5 hope that helps a lil

  9. #69
    Lodemia is offline Who wants to make a deal?
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    To add to the chart, my 1989 mark vii housing width measures 54" via tape measure, so I assume it is the same as the others of the same era-54.096. It appears that the only difference is the axles.
    T-Birds can't fly. Ask how I know...

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