Thanks to all this is defintly a good place to start. I've heard that since the later 09's the was and air sys. hooked in to the 7th injector but i didn't know that the early 08's could be upgraded. truck only has a little over 200,000 mi. and just about 5000 Hrs. Our season will be over soon (paving) so it looks like i'll have something to do in the off season. Thanks Wayne