Cant Get passed DriveTrain Option

I can’t get past the Drivetrain option in car designer. All options are selected, but still can’t get past it to complete my car build.
Same with all builds. I tried to make another cheap build and had the same issue. Need help not sure what step to take next.

select a gear count


That was it I cant believe I missed that thanks!!

As LS stated previously, you forgot to select the number of gears your transmission will have - after that, you must select a differential type before you can continue the design process. The exact number of gears you need, however, depends on the era and purpose of your vehicle.

New drive types will become available after the correct way building the frame.