I am looking at a 2001.5, 5 speed, 4x4 for a friend of mine. It is a one owner with 58,000 miles. The ad says it is the 245 hp engine but as far as I know, the 245 hp only came with the 6 speed NV5600. Correct? It is definitely a 5 speed stick. So is it a 235 hp then? He will have to look to see if it is a #53 block. Being that the truck was built in Saultio Mexico, is it more apt to have the Mexican block?