I might be able to fix the vehicle error by renaming the shiftlogic files my mod uses so it doesn't conflict with other mods like that dacia thing you have installed.
I've tried renaming the file, deleting the cache, reinstalling the mod, etc., but the aforementioned lua error occurs and i still can't shift to 3rd gear or higher. is there a way to revert just the transmission part to an older version?
I just updated the main file on the original post, so now the transmission JBeam looks for a Caprice-specific shiftLogic file that shouldn't conflict with anything. Hopefully, that fixes the LUA issue people have been encountering lately. If it doesn't, then I'm not sure what will, other than avoiding shifting past Drive altogether, if you can stomach it, God help you.