403b gearbox & diff ratios
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  1. #1
    Budding Architect ???? pugrambo's Avatar
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    Default 403b gearbox & diff ratios

    posted for member edgedweller


    undefinedundefinedundefined
    will i ever figgerout how to get a question posted on this forum?

    been fooling around on paper to make some sense of gearbox, diff and tyres ratios for my 403b. currently running standard gearbox through shortened 404 torque tube and drive shaft and diff onto 205/65/15 bridgestones. suprisingly i don't seem to be getting
    the durablilty that i am looking for. and am considering running hotter motor to drive 403o/d
    gearbox through what diff? can no longer find info on 403b g/box & diff ratios. and am confused by figures such as: diff ratio 403 .174
    504 3.90
    wagon 4.222
    break 4.111

    g/box ratio c2m2 wagon
    1st .328 3.683
    2nd .590 2.169
    3rd 1.00 1.408
    4th 1.239 1 100

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    when i was little i thought i was smart enough to work through these variences, now i'm not so sure.

    so i could put the big motor in and run the o/d gearbox with the 4.222 diff and keep the same rims/tyres and find out what would happen, but i'm hoping that some of you guys have already solved these questions and could save me from alot of work and some embarassment. here's hoping anyway and more motoring pleasure to youall.

    regards
    edgedweller
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  2. #2
    Budding Architect ???? pugrambo's Avatar
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    diff ratios are as follows

    .174 = 5.75
    .160 = 6.25
    .146 = 6.75

    now they are

    403
    403L
    403U5
    403U8

    403L and 403 U5 had the same diff

    then the 403B had the 4.2 diff where as the straight 403 had the overdrive box and the 5.75 diff

    the overdrive box ratios were

    1st 0.310
    2nd 0.590
    3rd 1
    4th 1.324

    then they changed to a later C2 box

    1st 0.328
    2nd 0.609
    3rd 1
    4th 1.328

    the C3 box there was also two types

    1st 0.245
    2nd 0.452
    3rd 0.704
    4th 1

    1st 0.250
    2nd 0.446
    3rd 0.693
    4th 1

    i hope that helps you out a bit
    3 x '78 604 SL

    1 x 2018 3008

    1 x 2000 Citroen XM,

    1 x '98 306 GTi6 sadly sold

    1 x secret project

    1 x '98 406 STDT troop carrier and i don't care if it stinks, i don't sniff it's arse Death by wank tank

    1 x '99 406SV 5spd wagon, time to burn more fuel

    1 x 1994 605 SV3.0

  3. #3
    1000+ Posts edgedweller's Avatar
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    Default g/box & diff ratios

    undefinedundefinedundefined

    With thanks to pugrambo,

    the figures certainly help, but i am still short of understanding.

    if possible i would like to converse with anyone else who has experimented with different combinations of drive lines in 403b's, to find out what actually happens. bearing in mind that i'm contemplating a bit more long distant travel, and that this is my daily drive and that i'm probably happy to drive it as a three speed arround town.

    more cheers edgedweller

  4. #4
    Budding Architect ???? pugrambo's Avatar
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    we ran a 403B with a C2 box and 4.2 diff for quite a while

    on a flat road the car would cruise very easily at 80mph all day but the first sign of a hill the car would die

    the low first gear was good as it nearly always had a trailer behind it loaded up

    the car really needed more power from the engine to utilise the overdrive with the 4.2 diff

    this is a combination i would never use unless the engine had more grunt as the standard 403 engine really isn't enough to use the overdrive with the 4.2 diff

    but seeing as you have the power give it a go
    3 x '78 604 SL

    1 x 2018 3008

    1 x 2000 Citroen XM,

    1 x '98 306 GTi6 sadly sold

    1 x secret project

    1 x '98 406 STDT troop carrier and i don't care if it stinks, i don't sniff it's arse Death by wank tank

    1 x '99 406SV 5spd wagon, time to burn more fuel

    1 x 1994 605 SV3.0

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