Rear end options

Discussion in '1974 - 1978 Mustang II Talk & Tech' started by fastmonkeywheel, Jun 10, 2007.

  1. With an automatic behind a turbo 4, the 8" would almost be overkill for strength. I used to run my 351W+C4 with a 2.79 8" and broke 3 transmissions without hurting the rear end at all.

    Stick shift is a different story, but since you're running a boosted 4, you still wouldn't be that hard on it even when abusing it. I've broken an 8" with a 302 + T5, and broken a 9" with the 351W + Tremec. Prior to putting a T5 behind my 302, I broke 2 RAD 4spds.

    Nice to see that another Turbo II will be on the road, with the same HP goals I have for mine. Too bad mine has been sitting in the garage for 3 years now waiting on me come up with an intercooler, intercooler plumbing, exhaust, wideband O2, and bigger injectors.
  2. Recently purchased a 1975 Mustang II Ghia. The rear end is growling at low speed. While I am having that looked at, I was thinking about having the rear end turned into a posi rear end. Is there a kit that can be purchased to convert the 8" C2 that came stock? If so, where do I find one that is reasonably priced?

    Any help much appreciated.

  3. Summit Racing powertrax unit.
  4. Could you please clarify what you are asking.
    The information that I pulled off of the tag on the rear end was.

  5. ?
  6. To Jeff and All,

    I am asking for clarification of what "Summit Racing powertrax unit." means.

    I use to work on cars when I was a teenager, but have not until now that the kids are leaving home and I can finally afford to play around with older cars. Therefore, I am a bit rusty.

    I am trying to find out what my options are as far as using the existing stock rear end in my '75 Ghia and turning it into a posi rear end if possible.

    The Codes I listed before are off of the tag on the rear end.
    I looked them up and the first line means:
    3.00:1 ratio
    8" Gear diameter
    C2 differential type
    It is a removable carrier type rear end.

    Hope this helps to clarify things.

  7. To Jeff and All,

    I am trying to get clarification by what Jeff meant by "Summit Racing powertrax unit."
    I have not really worked on cars since I was a teenager and now that my kids are FINALLY leaving home, I can afford $$ and time to work on an older car. Therefore, I am a bit rusty (me, not the car!).

    What I am trying to do is to use my existing rear end in the '75 Ghia and turn it into a posi rear end if possible. I am just wondering what my options are.


  8. Link to Powertrax web site.

    There are numerous options for the Ford 8", not as many as the 9" but still .....

    I suggest starting a new thread asking this question. I think you'll get more action/responses.
  9. Okay, I feel like an idiot, but I can't figure out how to start a new thread about my posting.

  10. Mark,

    When I do that it tells me that I cannot post new threads. On the bottom of the page that I am looking at now, it says I can post new threads, but when I went to the page that you directed me to, it would not let me post a new thread and on the bottom of that page it says that I cannot post new threads. Damn it, I am just trying to get an answer to my question!

  11. Thank you very much. That is exactly what I needed.

  12. You obviously haven't driven a well-modified 2.3. A week after getting doing a ported head/cam/turbo swap on my SVO, my V8-spec T5 started grinding going into 3rd and doesn't like being speed shifted into 2nd. Modded 2.3 turbos make just as much torque as a V8, albeit only when under boost. Powershifting will be out of the question with a RAD-4.