ive read many forums about parts swapping between different vehicles, and a fairly common one is putting 4wd into vehicles not originally designed to have it. right now im trying to make the moonhawk 4wd. what i know: i copied the differential and driveshaft coding to the front suspension file and changed the names of all the parts to align with their respective axles. my first attempt is what most forums suggest is the end, when in fact its not: "copy diff code, change letters, good to go!" but this results in an awd car, not a 4x4 one. since the games answer to two diffs connected to the same drive node is an open center diff effect (in the moonhawk the trans output node is "tra1"). the side effect of this is that the wheels will sometimes blow up from overspeeding when the axle goes airborne and the center diff sends all the power in its direction. so my solution to this is send the trans output to a transfer case i swap in from the d-series/roamer, then connect the two separate driveshafts to their respective outputs. the game treats the front and rear driveshafts as the same beam according to the jbeam file, unless you create a new front driveshaft like i did. making them two separate beams makes the transfer case swap possible. what i dont know: how much i need to do in the way of creating a beam structure around the transfer case, or if it needs one at all. it appears the correct way to do this would be to define new beams between the output of the transfer case and the output of the transmission, but i dont know if that needs to be beefed up with triangles and all that jazz to handle torque, or if i can just direct connect the output of the current moonhawk transmissions ("tra1") to the input of the transfer case, then the same with the driveshafts, essentially leaving the case "floating" in the drivetrain. i also dont know if collision between the case and the floor is gonna be an issue or not, or if the case is even a physical part...? any deeper knowledge of jbeam structures is appreciated! learn something new every day!