Changing Gti 180 final drive / gearbox ratios
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  1. #1
    Tadpole
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    Default Changing Gti 180 final drive / gearbox ratios

    After much looking around for final drive ratios for my Gti 180 BE4/5 gearbox, I have found that there are genuine parts available at reasonable cost from Peugeot (much cheaper than Quaife). The parts I'm using (crownwheel & pinion) are from a 307 XSP as sold in NZ, and the final drive ratio is 4.76 (17x81) which is perfect for hillclimbs and rallying (~204 km/h top speed). The 307 uses the low final drive in conjunction with taller 4th & 5th gears to get lower cruising RPM, I guess due to the extra weight of the car.
    The other option I tried was to use BE1 parts - the shafts are different, the input shaft is longer as it has a different 5th gear with about 50% longer (stronger) splines, and the output shaft and it's 3rd/4th gear are also different with around 3x longer splines for strength. This meant retrofitting the entire BE1 gear assembly into the BE4 housing using the BE4 selectors which did work but required soke modification for reverse gear. Also I've noticed the BE4 differential is much beefier than the BE1 or BE3, but is still interchangeable.

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  2. #2
    1000+ Posts kermit's Avatar
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    Quote Originally Posted by targa180
    The parts I'm using (crownwheel & pinion) are from a 307 XSP as sold in NZ, and the final drive ratio is 4.76 (17x81)
    That is a lot shorter the the ratio specified here http://206gti.net/faq/#46

    Is the XSP a 1.6L?
    Cheers Simon
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  3. #3
    Tadpole
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    No, it has the EW10J4 engine. Follow this link for info on all the 307 engine/gearbox combinations:
    http://217.118.34.250/Pug3607/307/info/gb/b2cb4bk3.htm

    The model names may be different over here - I got the model name from the Peugeot NZ technical manager who confirmed the parts interchangeability and gave me the part numbers.

  4. #4
    1000+ Posts kermit's Avatar
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    Quote Originally Posted by targa180
    Follow this link for info on all the 307 engine/gearbox combinations:
    http://217.118.34.250/Pug3607/307/info/gb/b2cb4bk3.htm
    So NZ gets four 2.0L 138 models. Two have 16" wheels and the other two have 17". Then within the wheel size break down you can have a choice of 4th & 5th gear and final drive ratios.

    The NZ equivalent to the Aust model listed here http://206gti.net/faq/#46 is unit ref: 20DL48

    I wonder if there is a typo on the final drive of 20DL49(16") as a 12x81 final drive is 6.75:1 The other 20DL49(17") is 17x81 (4.76:1).

    Is Sime Darby the NZ Pug importer? I can't imagine they are other wise your choices would be the same (read limited) as OZ's are.

    I always wanted to change the 5th gear ratio (make it taller for highway cruising) on our now croaked 138, but by the time I got around to investigating it the car was already 4yrs old. If I ever get hold of another 138/180 I'd do change ratios from day one.
    Cheers Simon
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  5. #5
    Tadpole
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    It is a typo - I noticed it as well but then looked at the km/h per 1000 rpm and it worked out to 17x81. Sime Darby is the importer in NZ, and we don't get all the models listed on the website - this is a list of all options available from the factory and Sime Darby import a small subset. Currently we only get the 5 door & SW with either 1.6 (XS), 2.0 (XSP) or Hdi engine in either auto or manual but there were 3 door models available earlier.

  6. #6
    1000+ Posts PeterT's Avatar
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    Citroen Xantias also have a 17x81 diff, to make up for their rather large 185x65/15 tyres. Do a search in Citroen section. I posted a website link with the full specs some time ago.

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  7. #7
    Tadpole
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    Quote Originally Posted by PeterT
    Citroen Xantias also have a 17x81 diff, to make up for their rather large 185x65/15 tyres. Do a search in Citroen section. I posted a website link with the full specs some time ago.
    I saw that, but the BE3 output shaft won't fit the BE4 due gearset to different splines on 3rd/4th gear. At least I assume the splines changed between the BE3 & BE4 model and not BE1 & BE3 because I've never seen a stripped down BE3 output shaft.

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