2hi axel binding in reverse with wheel cranked to the right only? Dana 70 4x4

 so i got something in my drivetrain kinda hooking up making a poping sound in 2high, It only dose it in reverse with the wheel cranked to the right.(in 2hi) i don’t feel it or hear it with the wheel cranked to the left. I also can’t make it pop going fed in either direction (in 2hi) 

In 4high  I can make it pop going forward with the wheel either way, like barely half to 3/4 turn not even cranked. if i kept wheel straight in sounds fine but turning the wheel either way it was binding up hard. I was on  dry pavement so i know it 4high this is somewhat normal.

 I am more concerned about the 2hi noise. I cant find any play in any axel joint or u joints. I just had the diff cover off and inspected the oil, was a little dark and there was a little fine metal on the magnet, but it didn’t look to bad, there’s 10k miles on it since i rebuilt it when the cone on passenger side where spider gear rides grenaded, and i had to dig out all kinds of metal. That being said i couldn’t feel any play in rear wheel bearing or rear pinnion, That would be the 3 gear oil change since the rebuild in 10k miles there’s a little more metal on the mag then i would like to see and the oil was a little darker then i like but i couldn’t find any chunks of metal in the housing and i rotated the axels and everything in the 3rd member that i could see looked fine. I checked backlash and it was right at .008, that’s where i remeber setting it when i rebuilt it 10k miles ago . Any input is appreciated as i am gearing up to two a 15k load this early spring and i would prefer not to be the guy on the side of the hwy!!

thanks