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3 Studs Wide Differential Bracings

March 26th, 2009 Leave a comment Go to comments

Two ways to make your 3 studs wide differential sit where you want it to sit, whatever load applied, and to deal with the half-axles’ tendency to slip out.

The new differentials are sure a great innovation, but a bit tricky to use. They have to me mounted very steadily in order to avoid snapping of the gears, and they still have the tendency for their half-axles to slip out. Here are two simple liftarms-based bracings that solve both problems – they are robust enough to keep the differential where you want it to be, and they use 5.5-studs long half-axles to deal with the slipping out. Each version cosists of 41 parts, and instructions for both can be found below. Parts list for the first version is here, and for the second version – here. Personally, I prefer the first version, but I also appreciate diversity – hence two versions.


1.png ver1.gif ver1_1.gif ver1_2.gif ver1_3.gif ver1_4.gif ver1_5.gif ver1_6.gif ver1_7.gif ver2.gif ver2_1.gif ver2_2.gif ver2_3.gif ver2_4.gif ver2_5.gif ver2_6.gif
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  1. TuanNguyen
    August 23rd, 2011 at 05:11 | #1

    I tried to follow the instruction via small picture and finally complete it. The version 1 is better for prevent slip gear than the version 2. I post some new bigger picture for others easier to build

    # Version 1









    #2 – Version 2












  2. Sariel
    July 24th, 2010 at 20:44 | #2

    Sure, if you suspend it.

  3. victor
    July 24th, 2010 at 20:08 | #3

    could this idea can be used like the suspension like the scania dump truck?

  4. Sariel
    March 31st, 2010 at 16:04 | #4

    If your PC has problem opening these pics, then I have no idea how to make a downloadable version it can handle.

  5. gimba96
    March 31st, 2010 at 15:54 | #5

    I know but my pc cant open the pictures.
    So i thought maybe you could a downloadeble version

  6. Sam
    January 15th, 2010 at 04:01 | #6

    I’m currently modifying the lego crane truck with a diff lock, while trying not to alter the model to much. The main problem I am having is while I need the gears around the differential itself it means it can’t fit in a strong brace that is compact enough and wont slip off the drive gear. Any suggestions?

  7. Sariel
    December 17th, 2009 at 19:53 | #7

    The instruction is like 30 pixels above your very own comment. How did you manage to miss it is beyond me.

  8. joalegofreak
    December 17th, 2009 at 17:00 | #8

    could you add instrutions?

  9. Sariel
    December 8th, 2009 at 19:56 | #9


  10. joalegofreak
    December 8th, 2009 at 19:23 | #10

    where do you buy those differentials?

  11. Sariel
    August 21st, 2009 at 12:44 | #11

    Cool. I’m not sure how would the knob wheels work with a really huge load. I’ve seen some cases in Truck Trial vehicles when huge torque caused the knob wheels to transfer the drive unevenly, in small ‘jumps’.

  12. Adi
    August 21st, 2009 at 12:33 | #12

    I did it!! Instead of using normal gears I used the Knob Wheel gears and they work really well.

  13. Sariel
    August 16th, 2009 at 13:28 | #13

    So there’s your answer.

  14. Adi
    August 16th, 2009 at 11:56 | #14

    The gears always slip.

  15. Adi
    August 16th, 2009 at 11:28 | #15

    T’ve tried but no other ways work.

  16. Sariel
    August 16th, 2009 at 10:44 | #16

    Are you sure this is a smart question?

  17. Adi
    August 16th, 2009 at 07:46 | #17

    I really want to make this but i dont have the differential. Is there any other way to build it.

  18. Sariel
    July 1st, 2009 at 15:51 | #18

    These are not kits, and if you need parts to build them, you can do it at shop.lego.com or bricklink.com.

  19. Prakash.K
    July 1st, 2009 at 15:26 | #19

    how to buy these kits? What will be the cost? Where are all it is avilable in india?

  20. Sariel
    April 28th, 2009 at 21:55 | #20


  21. Boris
    April 28th, 2009 at 18:08 | #21

    I think all of your projects are awesome! Just wanted to ask you, in what program do you design some of your projects?

  22. GuiliuG
    April 13th, 2009 at 12:01 | #22

    The second has a big advantage: the support of the axis that supports the 20T is not mobile. But i prefer the first version :p

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