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Thread: Gearbox and Lt230 Transfer Q's - 4BD1-T

  1. 16th November 2013, 10:01 PM #21
    110Landy86
    110Landy86 is offline Master
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    Sorry I should clarify. the existing/ stock gearbox is factory fitted to the Isuzu .
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  2. 16th November 2013, 10:17 PM #22
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    justinc
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    in that case it will be 1.222:1 or 1.003:1. most were the 1.003 but mine was 1.2:1. i converted to lt95 when i fitted the 4bd1 to my rrc, i have also seen a factory fitted 1.2 ratio lt230 to a 4bd1 120" 1991 model.


    jc
    The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
    The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈
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  3. 1st December 2013, 09:44 AM #23
    110Landy86
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    Hey Justin when you say 1.222:1 is that 1.222 rev of the output shaft to 1 rev the input or vice versa?

    I plan to increase my t/c gear ratio as atm I'm sitting at about 2800/2900 at 100km/hr which is ridiculously high, given the original was about 2300/2400 at similiar speed.

    Basically is it a 1.4:1 or 1.003/0.996:1 ratio that would produce a higher ratio? (Without changing tyre sizes- running original 16R).

    Also, are you or others aware of aftermarket higher gear ratios??

    Cheers JP
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  4. 1st December 2013, 10:24 AM #24
    slug_burner
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    Quote Originally Posted by 110Landy86 View Post
    Hey Justin when you say 1.222:1 is that 1.222 rev of the output shaft to 1 rev the input or vice versa?

    I plan to increase my t/c gear ratio as atm I'm sitting at about 2800/2900 at 100km/hr which is ridiculously high, given the original was about 2300/2400 at similiar speed.

    Basically is it a 1.4:1 or 1.003/0.996:1 ratio that would produce a higher ratio? (Without changing tyre sizes- running original 16R).

    Also, are you or others aware of aftermarket higher gear ratios??

    Cheers JP
    That is 1.222 turns of the input shaft for 1 turn of the output shaft. If you want to drop your engine revs for the same road speed then you will have to go to the 1.003 or the .996.

    If you look through the 4BD1 T threads you will get opinions as to what ratio is best. Look through Justin Cooper's Isuzu related threads and I am sure he has spoken about it.
    Quote Originally Posted by benji View Post
    ........

    Maybe we're expecting too much out of what really is a smallish motor allready pushing 2 tonnes. Just because it's a v8 doesn't mean it's powerfull.

    One answer REV IT BABY REV IT!!!
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