[MOC] The Most Ultimate Sequential Gearbox

[paave]

I've been thinking of a simple yet effective sequential gearbox for a long time, and since LEGO had released a 18T clutch + 14T gears, I've come that now it's possible to partially reveal it

It's a kind of successor of the Anto's 6NR gearbox 

The main difference is that there are no multiplier gears. There are straight up-down transitions connected left-right with equal gear ratio. With the current 6 clutch gears existing, it's possible to make 6 speeds, but to fit the 15x11 frame, only 5 speeds for now. There are still no studio files for new gears, so I used 16 gear recolored. The orange is 18T clutch, and the white is 14T. The upper 16T gear - axle - is connected to engine, the yellow connector - to wheels, the red connector - to turn drums on 45°

It will be possible to create 8 speed gearbox (or 9 with specific drums?), when LEGO releases 14T clutch + 18T, 10T clutch + 22T, and 22T clutch + 10T gears. If someone can design these parts for 3D print ready, that would be nice

All the possible gear ratios:

1. 8/24 = 0.33
2. 10/22 = 0.45
3. 12/20 = 0.6
4. 14/18 = 0.77
5. 16/16 = 1
6. 18/14 = 1.28
7. 20/12 = 1.66
8. 22/10 = 2.2
9. 24/8 = 3

I don't have all the gears needed now, but with what I have, it works well

You can use this gearbox wherever you want and I wouldn't mind to see it in the future ultimate set with probably different drums

 

Edited Saturday at 12:41 AM by paave

[danielhstahl]

You can also make a very efficient (two "axles") 6 speed plus neutral with the new gears.  It would be still be compact but longer than your solution.    

 

The new drums, alas, I think are pretty useless outside of a complex nine speed.

[1963maniac]

16 hours ago, danielhstahl said:

You can also make a very efficient (two "axles") 6 speed plus neutral with the new gears.  It would be still be compact but longer than your solution.    

I would like to see and build that!

[danielhstahl]

3 hours ago, 1963maniac said:

I would like to see and build that!

I haven't built it (even virtually) but it would be like https://rebrickable.com/mocs/MOC-201002/paave/realistic-4-speed-sequential-gearbox/#details but with the 24x8 (clutch) and 14x18 (clutch) and the three blue (motorcycle) drums with the 8 gear ratchet.

[SNIPE]

Great work, perhaps this can be the basis for a more compact 9 speed transmission for the 42232 koenigsegg set!

[paave]

On 7/18/2026 at 11:37 PM, SNIPE said:

Great work, perhaps this can be the basis for a more compact 9 speed transmission for the 42232 koenigsegg set!

Thanks!