Fitting new 6-speed manual box to D4D





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  1. #1
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    Default Fitting new 6-speed manual box to D4D

    Just out of interest sake, has anyone considered fitting the new 6 speed manual gearbox to the 3.0 D4D and is it possible?

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    Default Re: Fitting new 6-speed manual box to D4D

    Why would you want to do that?

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    Default Re: Fitting new 6-speed manual box to D4D

    Quote Originally Posted by Nicholas Lisse View Post
    Why would you want to do that?
    Looking for the shorter first gear.

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    Default Re: Fitting new 6-speed manual box to D4D

    Quote Originally Posted by PUW View Post
    Looking for the shorter first gear.
    use low range
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    Default Re: Fitting new 6-speed manual box to D4D

    Had a quick comparison run on my gear ratio calculator.

    Would be a very nice swop for off roading.

    @ 4500rpm in first you will do 40km/h with the 6 speed and 50 with the 5 speed.
    Second gear 80 for the 6 speed and 94 for the 5 speed.

    120 km/h with the six speed 2300rpm in 5th and 1797 in 6th.

    120 km/h with five speed 2343rpm

    Six speed have a nicer ratio spread.

    If you can find on go for it.
    Last edited by grips; 2017/01/19 at 05:48 PM.
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    Default Re: Fitting new 6-speed manual box to D4D

    Quote Originally Posted by grips View Post
    Had a quick comparison run on my gear ratio calculator.

    Would be a very nice swop for off roading.

    @ 4500rpm in first you will do 40km/h with the 6 speed and 50 with the 5 speed.
    Second gear 80 for the 6 speed and 94 for the 5 speed.

    120 km/h with the six speed 2300rpm in 5th and 1797 in 6th.

    120 km/h with five speed 2343rpm

    Six speed have a nicer ratio spread.

    If you can find on go for it.
    That is exactly why I would like to do it! Then add a diff ratio change to get the revs back up in 5th and 1st low will be great for off road!
    Last edited by PUW; 2017/01/20 at 07:44 AM.

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    Default Re: Fitting new 6-speed manual box to D4D

    PUW - I sound dom, because I am with these things. VERY.

    But just try make sure that 6th will work with the D4D's torque characteristics. It's a looong gear.

    But I guess (??) if you change diff ratio that 6th is shorter, then your 1st gear would be even shorter than the Revo's, and that would be VERY sweet!!

    The Revo manual has a VERY VERY nice 1st gear for offroad going. It idles up inclines like you wo'nt believe.

    But...........just asking - would'nt your low range 3d gear do just about the same?? (meaning, about the same as a shorter 1st gear on the 6 speed box).

    Once again, just make sure about that looooong 6th gear. At 130 I'm doing 2000 RPM's. The 2,8 manual has 420 nM, and that's between 1400 and 2400 RPM's. The D4D is 343 nM. That's 80 nM diffs.
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  8. #8
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    Default Re: Fitting new 6-speed manual box to D4D

    Quote Originally Posted by Petri Oosthuizen View Post
    PUW - I sound dom, because I am with these things. VERY.

    But just try make sure that 6th will work with the D4D's torque characteristics. It's a looong gear.

    But I guess (??) if you change diff ratio that 6th is shorter, then your 1st gear would be even shorter than the Revo's, and that would be VERY sweet!!

    The Revo manual has a VERY VERY nice 1st gear for offroad going. It idles up inclines like you wo'nt believe.

    But...........just asking - would'nt your low range 3d gear do just about the same?? (meaning, about the same as a shorter 1st gear on the 6 speed box).

    Once again, just make sure about that looooong 6th gear. At 130 I'm doing 2000 RPM's. The 2,8 manual has 420 nM, and that's between 1400 and 2400 RPM's. The D4D is 343 nM. That's 80 nM diffs.
    Yes, it will be long, hence the diff ratio change to get things back to normal. I did a spread sheet to check what I need to do. I want a slower more controlled low range speed.
    Attached Images Attached Images
    Last edited by PUW; 2017/01/20 at 08:48 AM.

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    Default Re: Fitting new 6-speed manual box to D4D

    Sorry, I made a mistake with the previous spread sheet!
    Attached Images Attached Images

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    Default Re: Fitting new 6-speed manual box to D4D

    Try this ratio calculator

    http://www.grimmjeeper.com/gears.html
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