got a 99 blazer 4x4 auto trans. motor blew up. found a 2000 astro van motor with 86000 miles. will it fit? will the computer work without swapping anything? can i use the same harness if i dont have astro vans harness? astro van probably isnt 4x4 so does that matter? bolt up to tranny okay also? i know the oil pan is prob different but what about anything else? will it work is what im asking thanks guys