If my steering wheel is turned when I take off I get a chattering feel from my rear diff. If I turn after I take off then it doesn't do it. I have serviced it several times since I put it (14bff) in a few months ago. I have even put in LSD additive and nothing changed. I assume my carrier is a gov lock, but I'm not positive,. It has no openings around it anywhere except for one small one close to the ring gear bolts. It is a 2 piece unit that tapers down from the ring gear to the carrier bearings. It's from a '75K20. Any ideas??