I finally had the chance to get the new burb in some mud and something is grinding in the front D44. It sound to me like it is coming out of the diff but not sure. My question is, could this be somekind of locker the previous owner installed? I was told that some lockers make alot of noise when engaging? It did seem that it only started when my rear end began to loose traction. At this point, I did not have it in 4 wheel drive thought. Is a 76 burban an all wheel drive? I have noiced during hard turns I get tension in the steering like it is locked into 4. It is a 3/4 ton with d44 and 14bff? Any ideas or trouble shooting I can do? Thanks guys.