I've got just the opposite concern as a previous poster: I've got a potential issue with my bell housing (289/upright ZF) being too low. I'm aware that raising the engine will increase U-joint wear, and the CV coupling has restrictions as well, but are there other factors that limit the safe angle of the driveshaft as long as there aren't any suspension interferences at full travel? Increasing the wheel diameter isn't an option, and a skid plate is about the only alternative I have.