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Thread: Info on F series diff ratios above 4.3

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    Veteran FAST EDDIE's Avatar
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    Default Info on F series diff ratios above 4.3


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    What came with a higher ratio than 4.3 in a F series diff?
    I already have 4:3 gears and wanna go higher cos im having gearbox issues and wanna use 3rd not 2nd.
    Last edited by Golberg; 9th March 2009 at 05:26 PM.
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    Veteran Jonny Rochester's Avatar
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    If TRD did make it, you could find it yourself.

    http://trdparts.jp/english/

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    cheers man
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    Senior Member Anthony's Avatar
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    Hey Eddie, you can get 4.556 from the front diff of some hilux surfs, or 4.778 from the rear diff of a diesel 4wd townace import only)

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    the higher ratios usually come in the front of hiluxs. i have also seen 4.6 in a yr22.

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    first letter in diff code is ring gear size. these are the relevent ones that we use.

    6.38" S
    6.7" T
    7.1" E
    7.5" F
    8" G

    first two numbers in the code are the ratio.
    here they all are.

    3.300 01
    3.360 02
    3.545 03
    3.556 04
    3.700 05
    3.889 06
    3.900 07
    4.111 08
    4.222 09
    4.375 10
    4.444 11
    4.625 12
    4.790 13
    4.875 14
    5.125 15
    5.286 16
    5.600 17
    5.714 18
    5.833 19
    6.167 20
    6.667 21
    6.780 22
    6.833 23
    7.640 24
    4.556 25
    5.571 26
    3.364 27
    4.300 28
    4.100 29
    3.727 30
    3.909 31
    6.591 32
    4.807 "
    7.503 33
    5.583 "
    6.781 34
    4.786 "
    7.636 35
    5.600 "
    4.778 36
    3.583 37
    3.417 38
    3.154 39
    5.375 40
    3.308 41
    6.500 42
    3.550 43
    3.214 44
    3.533 45
    2.928 46
    2.929 "
    3.944 47
    3.356 48
    3.729 49
    3.400 50
    3.736 51
    3.722 52
    3.250 53
    3.941 54
    3.333 55
    2.821 56
    4.058 57
    3.238 58
    3.234 59
    3.519 60
    2.724 61
    2.892 62
    2.655 63
    4.312 64
    3.837 65
    3.071 66
    3.526 67
    3.095 68
    4.176 69
    5.857 70
    2.962 71
    3.949 72
    4.285 73

    3rd number will be 2,3,4 or 5. 2 is open (no lsd) with 2 spider gears in the differential. 3 is 2 spider, with lsd (some ma61 supras) 4 is 4 spider gear open, 5 is 4 spider gear with lsd.

    stock adm ae86 s312
    stock adm t18 t302 early t312 late
    stock jdm ae86 t282 or t283 if it has factory lsd.
    stock ta22 t292 mostly (4.1 ratio)

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    also in every case so far that i have found, an irs ring and pinion will work in a live axle diff and vice versa.

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    Quote Originally Posted by Anthony View Post
    Hey Eddie, you can get 4.556 from the front diff of some hilux surfs, or 4.778 from the rear diff of a diesel 4wd townace import only)
    Cheers for that Ant im guessing it will be the turb diesel version surf?
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    Quote Originally Posted by slydar View Post
    also in every case so far that i have found, an irs ring and pinion will work in a live axle diff and vice versa.

    wow thats some serious figures thanks slydar, i didnt quite understnad all that so correct me if im wrong haha realy appreciate all your help!!!!

    if im lookin at the hilux surf plate and seeing F4.5 then whatever number depending on lsd or open i should be on a winner?
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    and how do i physicaly know what ratio the diff is by looking at it and counting teeth im guessing?
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