I'm lookin at buying an 02 1500 with a 4.7... they say it needs an oil pump cause driving down the road the gauge bounces from 0 to normal... the truck had 150,000 miles on it... is it possible its the oil pump or more than likely a spun baring? Next question... will a 4.7 out of an 06 work in an 02, even swap nothing more to do?