To be honest I've never seen that truck before lol. I just took the cab off the Time Flys I edited and the front clip off my GDL. Rear is just some crap model I made lol.
Wrong section for a request, use this forum: http://sim-monsters.com/index.php?/forum/24-requests/
Also use this: http://sim-monsters.com/index.php?/topic/184-guide-requests/
Locking.
To be honest I think the diff code is dead on, Every trophy truck and pre-runner I have in game is modded to RWD and drives great. Not really trying to call anyone out on this but the people who make them are way off on the traction settings.