got a roaring sound , in all speeds. seems to be when coasting in 2 wd. as soon as I go to 4wd it goes away... transfer case or front differential maybe? help please..

 

This should be covered quite well in a tech article I wrote a few years ago -- 4wd Front Axle Clicking When in 2HI - Goes Away when in 4HI/4LO. Check it out and let us know if you have any further questions!

 

I will start a systematic check tomorrow. Ive always been amazed by your tech articles since 09" . thanks

 

A rotten vac line just needed the end trimmed off and replaced ... what about that? thanks.