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Thread: gear ratios

  1. #1
    Administrator Darren West's Avatar
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    gear ratios

    i have a th 350 that i got from a guy on here in southend but

    i can find this info on the side that says yoc 03n

    now is it possible that someone has changed the gear ratios in side

    i have a 55 chevy step side that at 50 mph it is doing 3.250 rpm

    my rear tyres are 235/75-15

    rear axle ratio is 3.73:1

    engine is a 5.0l v8 .

    can anyone work out my final drive from these figures please to help me
    Last edited by Darren West; 28-06-2015 at 17:40.

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    Official RnS Addict mygasser's Avatar
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    darren the th350 has a 1:1 top gear ratio, only 1st & 2nd are changeable.

    just typed in your tyre size and axle gear ratio here http://vexer.com/automotive-tools/speed-rpm-calculator and at 3250 rpm you should be just over 70 mph. are you sure of (a) axle ratio and (b) actual road speed (did you check with a sat nav?)
    Last edited by mygasser; 28-06-2015 at 17:53.
    need a job done on your project? i may be able to help.

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    Administrator Darren West's Avatar
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    so whats gone wrong then

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    Administrator Darren West's Avatar
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    the ring gear and pinion are brand new and fitted by stuueee on here so yeah I'm 100% sure of that

    i used my sat nav and a speed app thingy both read the dame speed of 50 mph

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    Administrator Darren West's Avatar
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    can the torque converter be the issue ... is it possible to change the ratios through this ?

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    Official RnS Addict mygasser's Avatar
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    is the box only selecting 1st and 2nd maybe? have you checked for 2 noticeable changes/drops in revs to tell it's going 1st to 2nd and 2nd to 3rd?
    need a job done on your project? i may be able to help.

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    Administrator Darren West's Avatar
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    well i feel 2 gear changes for deff
    1 at about 10 mph and another at 20

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    What are you using to check the engine RPM?

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    Administrator Darren West's Avatar
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    i have a electronic tacho connected to my electronic hei dizzy and I'm pretty sure its accurate

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    I wouldn't trust the tacho in the vehicle, at least not until I'd verified it's accuracy against a precision tacho.

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