Go to the Vehicle Config, do your changes, go to the last tab, type a name, press "Save", look for *name*.pc in Documents - BNG - vehicles - *vehicle name (pickup in this case)*
Do you mean a new preset? Like, a new vehicle showing up in the selector? The following might cause issues with the original, I don't think it's great and I don't know whether it'll work alright. Create a new info_*name*.json and change the things like the name there. Then put your .pc with *name*.pc into the same folder. Delete the original files you haven't changed, zip it and put it into the mods folder.
Does this only add the new engine? If so, you could consider adding modified body parts as well. There are several older mods on the forums that haven't been updated in a long time that you could contact the authors to use. For example, these: http://www.beamng.com/threads/gavril-d15-trophy-truck-mod.4710/ http://www.beamng.com/threads/baja-...ion-like-a-real-baja-pickup.9208/#post-128655 http://www.beamng.com/threads/d-15-baja-update-7mar2014.6798/ Just don't bump the threads, because these have all been dead for a long time.
this is a diffrent truck it will have custom parts evantuly i am working on the engine. --- Post updated --- will return back to beta. how to acsees the pickup engine file --- Post updated --- need help coverting burnside engine to pickup for my Retro engine