I have a 1989 gmc jimmy s15 has 240000 miles on it,the engine has only 40000 on it.How many miles would I determines on it when I type in the info on say the kelly blue book pricing?????

You should type in the 240 000 cause even though your engine only has that the body and vehicle as been through way more . So when they consider the price thier gonna be considering the over all car not just the engine . Hope that helps