I've been entertaining the idea of buying an old Wrangler and swapping damn near all the parts out so it won't be unreliable. My goal is to make it as reliable and efficient as possible. I don't want a new one because there's an old model that has the dimensions I want (LJ model) so I want to keep this thing running forever, and with decent fuel economy for an offroader so probably a diesel swap. Is it even possible to swap all of the critical components out of a car, like replace all the engine and drivetrain components with Toyota parts or something similar in reliability? What would the cost be for such an endeavor?