10 Speed Manual Gearbox
Manual 10-speed gearbox based on driving rings. Built from modules that theoretically allow to build a gearbox of any number of speeds.
Some time after seeing and redesigning Erik Leppen’s 4-speed compact gearbox, I started to wonder if the gears setup used there can be used for more than 4 speeds. It took some time, and eventually I was able to expand the design with the use of the extension transmission driving rings. It resulted in a gearbox that consists of partial repetations of the same 6-speed module, and this kind of construction theoretically allows to build a gearbox of any number of speeds. Having only two extension driving rings at the time, I have built a 10-speed model as a demonstration of the idea.
Due to the large number of gears, only part of them being used for each gear, the gearbox generates a considerable resistance. I was able to drive it with one PF XL motor, but some time later I have built a 14-speed version, and its resistance stalled even PF XL motor. Another concern is a huge ratio difference between particular gears, which somewhat negates the sense of using all 10 gears.
The parts list can be downloaded here, and there are ldr (MLCad format) models available in two versions: a complete one, and a bare-mechanics one.
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that’s friggin cool
course jason does have a point, 5 speeds with a splitter would be more compact 
Wish my lego set was as extensive as yours seems to be 
WOW
a semi uses a 4- 5or? speed main box with a added gear on the output shaft for high range( shifts from a low gear ratio to a 1:1 or so .. …….. you shift 1-4 then switch hi gear then start back at 1 now 5th and run through the gears again…. much more compact design with less frictional loss. and alot easier to incorperate into a lego model and realistic. all you need is to run a small air cyl or a lever in the cab to switch to high gear. usuing a slider like the rest of the trans or the old school way slidign the shaft with the gears on it.