Front vibration and noise 83 Suburban Diesel 4x4
One of my Suburbans has been sitting for a year. I pulled it with a dolly it to some property I have, so I took off the drive shaft to move it. The slip yoke was covered, but some fluid had leaked out before being covered. Yesterday, I reinstalled the drive shaft. I drove around town with no problem. Last night I drove 30 miles roundtrip. At highway speeds I noticed a slight vibration coming from the front. Also, what I initially thought was just road noise started to increased as I drove back home. The 4wd does engage and the vehicle will move forwards and backwards, but sometimes there is a loud pop or bang sound just after it engages.
I am not very familiar with the 4wd systems, but before I start spending more money than the vehicle is worth, I would like some advice on what some of the probably causes might be and if there is a service a service I need to have done. Thanks for any advice.