Beta Gavril Grand Marshal V8 Twin Turbo 0.63

Since people requested more gearboxes, I added... more gearboxes!

What's new?
- 6-speed automatic from the D-Series
- Gearbox with the ratios from the T56 transmission from a Camaro
- "Long ratio" gearbox with the ratios from the T56 transmission from a Viper
- 3.15 rear differential to go with the D-Series automatic
- 2.73 rear differential to go with the Camaro T56
- 3.07 rear differential to go with the Viper T56
- Adjustable race rear differential for those unhappy with my own choices

Note: The 6 speed manuals are direct copies from real gearboxes. The 6th gear in both gearboxes is meant as an overdrive. Without massive amounts of power the car may not accelerate in 6th gear. This is not a bug. Also, if you do use full boost and the car will accelerate in 6th gear, around 380kmh on the speedo the car will spin. I'm not sure if it's a suspension or tyre issue but the car was never meant to go this fast anyways.