I have a 90 Blazer 350, 700 etc.. When I first got it the rear was sagging and a loud CLUNK was heard when you came to a stop. Today I had put 2" blocks on the back to level it and now it only CLUNKS some times and not as hard. I'm getting alot of different ideas..rear brakes sticking, spider gears, driveshaft to transfer case needs greased, pinion..?? It shifts okay and not alot of play in drive line. Don't thinks its U-Joints.. any ideas appreciated. Thats my project tomorrow.