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Thread: F series diffs

  1. #31
    Toymods V8 Member Too Much Toyota CrUZida's Avatar
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    Default Re: F series diffs

    If you have 4 bolts in the top of the subframe, then its very possible you have an F-series subframe.

    Be careful with the halfshafts too.
    I needed to get my car rolling, so I whacked what ever I have available at the time in there.
    F-series subframe, F-series diff, and T-series swingarms and halfshafts.
    And the halfshafts were an inch (ish) too short.
    Peewee
    1985 MZ12 Soarer - 1UZ Powered
    2013 86 GTS

  2. #32
    Junior Member Conversion King whatthe?'s Avatar
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    Default Re: F series diffs

    dont suppose anyone has a pic of an f series subframe so i can compare?
    Project megap00 - Gave up and sold up. Money tree died

  3. #33
    Junior Member Conversion King whatthe?'s Avatar
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    Default Re: F series diffs

    Quote Originally Posted by CrUZida
    If you have 4 bolts in the top of the subframe, then its very possible you have an F-series subframe.

    Be careful with the halfshafts too.
    I needed to get my car rolling, so I whacked what ever I have available at the time in there.
    F-series subframe, F-series diff, and T-series swingarms and halfshafts.
    And the halfshafts were an inch (ish) too short.
    Sodoes that mean that it's possible someone managed to get a T series diff in there somehow? they're very similarly sized but the mount points on top are differently spaced (the front 2 mainly)
    Project megap00 - Gave up and sold up. Money tree died

  4. #34
    Toymods V8 Member Too Much Toyota CrUZida's Avatar
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    Default Re: F series diffs

    Quote Originally Posted by whatthe?
    dont suppose anyone has a pic of an f series subframe so i can compare?
    You know I love ya.



    Peewee
    1985 MZ12 Soarer - 1UZ Powered
    2013 86 GTS

  5. #35
    Junior Member Conversion King whatthe?'s Avatar
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    Default Re: F series diffs

    Champion, I feel the love , looks like I'll have to do a little comparing tomorrow. Worst comes to worst and i have to change it, will just that big bit that youve pictured there Peewee fit into the other suspension bits (ie what JCMF has pictured) or do I have to change the whole lot over?
    Project megap00 - Gave up and sold up. Money tree died

  6. #36
    Junior Member Conversion King whatthe?'s Avatar
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    Default Re: F series diffs

    Stupid Rep limit wont let me rep Cruzida and JCMF again yet, but know I will when I can and I appreciate the help
    Project megap00 - Gave up and sold up. Money tree died

  7. #37
    Toymods V8 Member Too Much Toyota CrUZida's Avatar
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    Default Re: F series diffs

    I've compared T series and F series swingarms before, and found then to be identical.
    Never measured, just looked carefully.

    T series arm's fit in F series subframe too.
    The halfshafts however, are not the same as far as I could tell, never mentioned the length.

    If you need some F-series halfshalts, I have a pair.
    Peewee
    1985 MZ12 Soarer - 1UZ Powered
    2013 86 GTS

  8. #38
    Junior Member Conversion King whatthe?'s Avatar
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    Default Re: F series diffs

    Thanks, but I have a couple of sets of half shafts (all part of the crap I bought cheap off JAZE before he went overseas). I might measure them up (T vs F) and see what the difference is just for fun!
    Project megap00 - Gave up and sold up. Money tree died

  9. #39
    Junior Member Conversion King whatthe?'s Avatar
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    Default Re: F series diffs

    Just had another awful thought, people who are running 4.1 ratios are always complaining about short gearing and I'd never noticed a problem, as my car sits happliy at 3200rpm at 110. Since it seems I have a T series and not the 4.1 F293 that I'm sposed to, is there any way of telling what ratio my T series diff is?
    Project megap00 - Gave up and sold up. Money tree died

  10. #40
    Toymods V8 Member Too Much Toyota CrUZida's Avatar
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    Default Re: F series diffs

    Given the stock tyres (225/60/14, diameter of 625mm), 0.783:1 W58 5th, 3200rpm, 110kph, and assuming your speedo is accurate, the T-series was a 4.3
    Peewee
    1985 MZ12 Soarer - 1UZ Powered
    2013 86 GTS

  11. #41
    Toymods V8 Member Too Much Toyota CrUZida's Avatar
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    Default Re: F series diffs

    And with a 7MGTE I'd be looking into a 3.73 diff.
    Peewee
    1985 MZ12 Soarer - 1UZ Powered
    2013 86 GTS

  12. #42
    Junior Member Conversion King whatthe?'s Avatar
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    Default Re: F series diffs

    Quote Originally Posted by CrUZida
    Given the stock tyres (225/60/14, diameter of 625mm), 0.783:1 W58 5th, 3200rpm, 110kph, and assuming your speedo is accurate, the T-series was a 4.3
    Tyres are now 255/45/17, not sure total diameter. Speedo is reasonably accurate, have tested it alongside my 04 liberty. Tacho is displayed on SAFC, direct feed from ecu. I'd be surprised if it was a shorter ratio than 4.1, 1st gear isn't anywhere near as bad as people make out it should be at that ratio. Mind you the 7M revs hards than a 5M variant too
    Project megap00 - Gave up and sold up. Money tree died

  13. #43
    Toymods V8 Member Too Much Toyota CrUZida's Avatar
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    Default Re: F series diffs

    Given a rear tyre of 255/45/17 (660mm diameter), then you'd need a 4.6666 diff to be doing 3200 @ 110kph
    Peewee
    1985 MZ12 Soarer - 1UZ Powered
    2013 86 GTS

  14. #44
    Toymods V8 Member Too Much Toyota CrUZida's Avatar
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    Default Re: F series diffs

    6500rpm in first would be 52kph.
    Peewee
    1985 MZ12 Soarer - 1UZ Powered
    2013 86 GTS

  15. #45
    Junior Member Conversion King whatthe?'s Avatar
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    Default Re: F series diffs

    Hrm, interesting and weird 3.7 would certainly give me a helluva first gear then! Maybe something is out with my speedo or something
    Project megap00 - Gave up and sold up. Money tree died

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