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Thread: A340e auto trans with 4.556 diff question

  1. #1
    Forum Member 1st year Apprentice
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    Default A340e auto trans with 4.556 diff question

    I have GZ20 soarer with the above mentioned AT and diff, does anyone here know the size of the drive gear attached to the propeller shaft output and the speedo gear tooth ? I need this info to calculate the tooth on speedo gear if I swap GB or diff. Thanks in advance and I promise to share my calculations here if anyone needs them.

  2. #2
    RZN169R+2JZGTEVVTI+R151 Domestic Engineer madmont's Avatar
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    Default Re: A340e auto trans with 4.556 diff question

    22:6..............
    Jealousy is a curse

  3. #3
    Forum Member 1st year Apprentice
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    Default Re: A340e auto trans with 4.556 diff question

    Thanks. From my longwinded calculation and with the gearset madmont has given, i found that for 1km traveled, the speedometer sensor turns 137 times. Or in simpler terms, one turn of the wheel, 3.66 turns of speedometer sensor (which is ratio of 22:6).
    So if I were to change the diff to 4.11, i would still need the sensor to turn 137 times per km travelled, the ratio needed would be close to 4.8 hence a 24:5 gearset would work.

  4. #4
    RZN169R+2JZGTEVVTI+R151 Domestic Engineer madmont's Avatar
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    Default Re: A340e auto trans with 4.556 diff question

    20:6....................
    Jealousy is a curse

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