This gearbox is a real challenge of rotation energy for every engine!
Even my V8-Engine comes upstairs with the high-speed Notch of the gearbox!
In this case, I recommend my: "4 cylinder stars engine" to power-up this gearbox...
This offers a delightful tremendous torque and speed that does not represent a problem for this demanding gearbox.
4 cylinder stars engine:
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=1661008368

Info Help:
I tested engine on the map: "gm_Bigcity", where it works relatively often. But if he does not work for the first time, simply delete "z" and spawn it again.
It works mostly good on: "gm_bigcity", but it is different from Map to Map e.g. On gm_Flatgrass he has often made problems with me to start.

(to start the engine, just push it into the red arrow direction!)

love this!!!!