Hey everyone! New to the forum but many Chevy trucks over my 45 years on this earth. Here is my problem, bought a 1993 K1500 and 3 days later the reverse went out so had the transmission rebuilt and rear driveshaft U joints replaced. Now as I drive it I have developed a clunk that happens at random speeds and sometimes 3 quick in progression. A few times when I have gotten in the gas to go up a highway hill I get a heavy clunk and the transfer case shifter pops up into neutral.....I let off the gas and shift back to 2WD and move right on down the road. I haven't been able to pinpoint the clunk as it feels like it moves around the drivetrain randomly. However it is more evident on a bumpy road. I guess the popping into neutral concerns me the most and I am hopeful someone can give me an idea in what to look at. Thanks!