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Thread: 2.90 ratio t series diff centre origin

  1. #1
    Forum Member 1st year Apprentice
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    Unhappy 2.90 ratio t series diff centre origin

    I put a post in general car talk about this centre back in January but have not had many comments. I was wondering what vehicle this 2.90 ratio I bought from a transmission repairer and installed in my stock RA28 housing would have been fitted in. thanks.

  2. #2
    Chookhouse Chooning Automotive Encyclopaedia Hen's Avatar
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    Default Re: 2.90 ratio t series diff centre origin

    A vague memory tells me that rear Tercel diffs were 2.9 T series, with large axles a.la Kouki AE86 T series. So maybe the crown and pinion you got is from one of them.

    But can the transmission repairer tell you?
    I need a working 4AGE bottom end. Pref smallport GZE, but all others considered. Also complete motors.
    Drift Volvo. Was fun. 2JZ next time.

  3. #3
    Junior Member Domestic Engineer TA22 GT's Avatar
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    Default Re: 2.90 ratio t series diff centre origin

    Never heard of a T series with 2.9 ratio. Whats it like to drive, does it struggle to get going? I have a gear set with 3.9 ratio if your interested...

  4. #4
    Twisted ****** Grease Monkey .T.'s Avatar
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    Default Re: 2.90 ratio t series diff centre origin

    t series 2.9 would have come from a celica gt4/ caldina etc

    fyi they actually go as high as 2.27:1 (i have one - starlet awd)

  5. #5
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    Default Re: 2.90 ratio t series diff centre origin

    thanks hen, no nobody in the transmission game I have asked including DIFF LAPPING in Brisbane could tell me. I put the whole centre in the housing and the axle splines fitted so I don't know what size axles the RA28 uses in comparison with the tercel. must be the same I guess.?

  6. #6
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    Default Re: 2.90 ratio t series diff centre origin

    you can still spin the rear wheels T/A but it's not registered so I don't know what it's like through the gears on the street.

  7. #7
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    Default Re: 2.90 ratio t series diff centre origin

    2.27 ratio, that's the highest final drive I've heard of in a car. I thought the 2.50 in some V8 commodores was pretty high. I think they run at about 1800 r.p.m at 100k.p.h in top gear don't they.?. what revs are you pulling at 100 k.p.h TEE ?.

  8. #8
    Junior Member Backyard Mechanic
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    Default Re: 2.90 ratio t series diff centre origin

    Depends on gear train between motor gearbox and transfer case as to overall ratio. Must be a big total reduction though geartrain.

  9. #9
    Twisted ****** Grease Monkey .T.'s Avatar
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    Default Re: 2.90 ratio t series diff centre origin

    I'm yet to use the setup (wifes awd project car) - its from an ep85 awd starlet. basically "c" series gearbox with transfer case etc - baby gt4 celica stuff. yes it has a big reduction. from memory i think its effectively geared down to around 3.7-3.9:1.

    T

  10. #10
    Car Butcher Carport Converter WDE_BDY's Avatar
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    Default Re: 2.90 ratio t series diff centre origin

    2.92 T series large spline diff is from a live axle Tercel, around 1985 from memory. I have one in the TA22 housing fitted to my KP61 Starlet, swapped the centre for small axle to suit.

    Callum

  11. #11
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    Default Re: 2.90 ratio t series diff centre origin

    They came on the Ae95 awd wagon.

  12. #12
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    Default Re: 2.90 ratio t series diff centre origin

    thanks for the information spikey. they must have a reduction through the transfer case you would think. I can't see why they would have such a high ratio in a vehicle meant to go off road, if only up to the snow ect. I will google this AE95 and find out more. thanks mate. AGO

  13. #13
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    Default Re: 2.90 ratio t series diff centre origin

    They would definitely have a reduction gear, as the gear ratios are good for the motor it drives a 4AFE, I don't know why they chose those gear ratio's but it works, go onto the Ae95 facebook sites lots of nice Ae95 getting modified now.

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