Here is a poser. If I have a titled Jeep with a rusted frame, I can replace the frame and it is still the same jeep. If the tub then is funky, I can replace the tub and it is still the same Jeep. If after that I decide it needs a new engine and tranny and swap it out, it is still the same Jeep? What determines the DNA of the Jeep? Assuming the DMV is ancestry.com for vehicles, what marker do they look for when they validate vehicular genealogy?