I have a 98’ s-10. 4.3/4l60e trans. Lowered 3/4. Bell tech spindles and zq8 stings up front and bellteck drop block in back. Replaced rear end with 8.5” with g80. I pulled it from a pick and pull. It was making a horrible vibration through out the entire rpm range. Thought maybe needed new carrier bearing. The old one was pretty trashed. So replaced it and the ujoints. Made it ten miles and threw the rear shaft off the rear end. I pulled the rear drive shaft with the rear end and used it. Left the front one in with the carrier bearing. Am I over looking something? Any advise would be helpful thank you in advance yall.