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Message: [QUOTE="jngreen, post: 39989, member: 679"] I found out one reason for a slight popping that I've had for awhile now when I come to a complete stop or sometimes when I accelerate from a stop. I also had/have a vibration. The slip joint in my rear driveshaft was binding and sticking. I had trouble even pulling it apart. Now, the main problem is the blue coating that Ford put on the splines inside the joint had started to peel off of the splines and everything started to corrode and rust because there was no grease. I spent about 2 hours with a pocket knife, torch, wire brush, and some brake cleaner trying to peel and scrape that crap out of the splines. I finally got it clean and greased it all back up so that it will actually slide in and out when the rear axle moves forward or backward, which is quite frequent on truck with 5 inch blocks and no traction bars. The popping and binding has gone away, but I still feel a vibration while driving highway speed. The slip joint feels like it has excessive slop in it now that the coating has been removed. I have been told that the coating is necessary and that you can't just grease the joint. Is this true. Do I really have to replace the driveshaft or at least the short section of the driveshaft and the slip joint to correctly fix the problem? Why did they ever do away with slip joints that have a grease fitting? What is my best option here? I'm guessing the parts from Ford aren't cheap, on the other hand, I'm not sure I want a used one that could possibly do the same thing. Could I find a shaft from an earlier truck that has no coating, and uses a grease fitting instead? Oh btw, my truck is a 2000 F350 ccsb 4x4. [/QUOTE]