Manually Changing Gears For The Wheeled Vehicle

Hello,
So I have my vehicle and I want it to be able to have a manual transmission. Did not seem like it would be an issue because it has its own implementation of it in the Wheeled Vehicle Class. But I tried setting the gear up and down, both with a true and false parameter, as well as setting the target gear. None of it works correctly. I have seen a few other people have the same question, but I have not seen an answer that works in my situation. Any help would be appreciated.

Thanks

Did you find out how to get this working ? SetGearUp / Down sets gear to 0, with true