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Thread: trans and rear end.

  1. #1
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    Default trans and rear end.

    OK... i havnt been on here in a while just getting things ready for my fiancee to start college today is her first day so thats out of the way. i am wondering a couple things.
    1. i have an 84 cougar and im putting an 89 mustang rear end in place of it... should i use mustang control arms or cougar control arms?
    2. also im installing a 4 speed transmission... the german 10 bolt... and i need to find a speedo unit for it so i can attach the cable to the trans. anyone know what ones will work or where i can find one?
    SIncerely
    eric

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    1. Cougar control arms and axles/brakes
    2. No idea what trans you're talking about...
    Long live the 4-eyes! - '83 Tbird Turbo

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    Borg-Warner T-5, maybe?

    You should already have the VSS unit/speedo driven gear bolted to the side of your current transmission (V6 = C5, V8 = AOD). You can reuse that and just change the driven gear to match your rear gear/tire combo. Are you keeping the stock speedo?

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    sorry... its the 4 speed transmission used in the 4 cyl mustangs from79-86... the srod ... the things ive noticed on it tho is that it has a cast iron center section. its got the gearing of the pintos but is for a fox body car... which was spose to have 4th as overdrive.
    btw... im still not on top of it all... ive got the cougar 7.5 with 2.73's and im putting the 89 7.5 with 3.73's in place. so u say i should take the axles out of the cougar rear end in put them in the mustang rear end? what would be the problem if i were to use the complete mustang rear end with cougar control arms, shocks?

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    eric i have the units from an a4ld, M5OD R-1 and the one thats in the c5 in the cougar... the M5OD R-1 is from a ranger. i just dunno if any of those are compatable with it.

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    Quote Originally Posted by the_intimidator03 View Post
    btw... im still not on top of it all... ive got the cougar 7.5 with 2.73's and im putting the 89 7.5 with 3.73's in place. so u say i should take the axles out of the cougar rear end in put them in the mustang rear end? what would be the problem if i were to use the complete mustang rear end with cougar control arms, shocks?
    The Mustang rear end will be narrower overall than the Cougar one...your wheels will wind up pulled in 3/4" on each side.

    Use the Cougar control arms and shocks....
    Long live the 4-eyes! - '83 Tbird Turbo

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    ok ... i dont mind the 3/4 inch part im using the wheels that came off that 89 mustang 2.3 also... btw i noticed in ford racing... they have an 8.8 inch set up for fox bodies... no axles n breaks... says to use ur own axles n such... says it doesnt fit the thunderbird... is that due to the slight change in widths?

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    The wheels would be the same between the two, so things are still going to be pulled in. If it were me...I'd use the correct axles. It's going to look silly otherwise.

    That thing in the catalog is misleading. The ONLY Tbird rear housing that is different than a Mustangs is the 86-88 7.5. The 80-85 7.5 and the 87-88 8.8's are the same...
    Long live the 4-eyes! - '83 Tbird Turbo

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    Just to clarify the 85 and 86 GT Mustangs came with a 5 speed. Not sure about the 4 cylinders but I am sure the SRod sucks. Very gappy in the rpm bands between shifts and 3rd to 4th is just terrible. Any kind of power and it will break.

    The Mustang rear end is narrower by the 3/4" as indicated. The lower control arms are different lengths so use the Cougar/T-Bird units. If you are only changing the rears for the gears then swap the center sections. There are several sites that show how to do the center section swap. While you are at it you can rebuild the trac-lok and pack an extra clutch in it.

    Easy way to check the differences between the two rear ends you have is to measure the axle housings flange to flange. That will tell you if the housing width is the same. If it is then simply use your old axles and everthing from the backing plate out on the brakes. If the housings are different in width then I would suggest the center section swap.

    Darren

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    http://www.5speeds.com/toploader.html


    The site says the SROD was used in mustangs till 83.


    There is also the T-04 transmission: T-04 (wide-ratio 4-speed manual [non-OD]: 4.07, 2.57, 1.66, 1.00:1).


    Also: http://www.foxtbirdcougarforums.com/...highlight=SROD
    -- 05 Mustang GT-Whipplecharged !! -- 87 5.0 Trick Flow Heads & Intake - Custom Cam - Many other goodies...3100Lbs...Low12's! http://www.fquick.com/V8Demon

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