Alpha Realistic 18 speed for T-Series 1.1

I added another driveshaft so that it works with the short and long versions of the T series. Also added support for the GTG T-Series expansion pack. I've included some configs for those if you have that installed. I've also added some configs for the other versions of the T series, including the car hauler.

For short frame or dual axle versions, you have to change the "front rear axle" driveshaft to "EF18 Driveshaft."

For long frame versions with single axles, you need to change the "rear rear axle" driveshaft to "EF18 Driveshaft Long."

For the GTG mods, there is a special version of the transmission for the custom engines. You must reselect this transmission if you change the engine in your configuration. You will also have to change the driveshafts for those configurations as well. If you run the triple axle version of the GTG mod trucks, you must only have a single driveshaft selected. So, either the front axle needs a driveshaft, or the mid axle needs a driveshaft, but not both.

Thanks to @John0090 for reaching out and helping with the GTG mod support and doing a little testing.

I also made a video showing me using the transmission and (poorly) floating gears. Hope that helps in case anyone is still confused about how it works.

-z