JEEP DRIVE SHAFT

I Bought This Jeep Used. It Has Full Time 4wd, So It Is Either 4wd High, Low, Or Neutral. When Purchased The Rear Drive Shaft Was Out So...

We Have Replace The Front Driveshaft Four Times And It Failed Again. Once Reaching 75mph Or Above It Goes Out. Slight Vibration Occures And...

I Recently Removed My Driveshaft For Repairs, When I Put It Back On The Whole Jeep Vibrates. Is There A Certain Way To Reinstall It?