Buildind my recent project what is a small scale pickup truck (coming soon) I' ve found myself in the need of a small gearbox with central differential (as it is a 4x4 vehicle). Besides the output axle had to be in the center. I have only 8 studs in the swb chassis.
The existing gearboxes are much larger and the output axle is usually offset by 1 stud. So I've suspended the process, closed my eyes with the promise that I wont open them until I find the solution. 12 days later (and 6 stones lighter) I had the picture of the working prototype in my head. So I've opened my eyes then went to the kitchen and ate everything from the fridge (even the shelfs) and built my new gearbox.
:-)
It is rather small, I'd love to claim that it is the smallest of it's kind. (but I'm not sure, so I don't say that yet)
Comes with the usual gear ratios:
1st gear 8/24 x 16/24
2nd gear 8/24 x 16/16
3rd gear 16/24
4th gear 16/16
The selector lever required some attention as the upper axles are 5 stud apart. I've been using some rare parts there:
-Technic Ball Joint with Through Axle Hole
[ Ссылка ]
-Bar 4L (Lightsaber Blade / Wand)
[ Ссылка ]
However this lever mechanism can do the shifting quite well, it still not "stupidproof" and need some attention while changing gears.
The frame (housing)
First. It is made so colorfull to help you dear watcher separate the parts on the video.
For motorized version I recommend to rebuild the housing using studded technic parts.
Input/Output
Outputs are self-explanatory, two red axle ends sticking out from the differential.
The input in the other hand is the axle with the 8tooth gear on the front. It is offset by 2 studs, but using a pair of gears it can be transfered to the center too. Whats more, it can be done on the front as well as on the rear side.
Hope you find it usefull, thanks for watching and reading.
Have fun
