drive shaft lenght

I chased vibes in my Jeep for months years ago. It ended up being the downward angle of the engine/trans was too much. My driveshaft angles were where they needed to be, drove me crazy. I ended up raising the rear of the trans about an inch, and then reshimmed the rear axle and everything was good. I hear ya though, took forever to figure it out and didn't want to drive/work on it. Good luck.