Popping from rear

Just bolted up a HighLifter 2" lift on the Rancher in my signature. Went for a short ride and noticed a pop everynow and then coming from the rear. Actually sounds like its next to my left foot.

With the rear wheels jacked up I have about from 12:00 to 1:00 in play in the driveline. Roughly 30°.

How tight should the driveline be and do the 350s have a certain problem like the old 300s with rear diffs? This quad has 120hrs of hard mud riding with bigger tires.

Going to pull the diff oil fill cover and see if the play is in the axle to ring gear. Then try to finagle the boot around on the swingarm to see if the play is there.

Now if the popping is the u joint hitting the swingarm, will take the rear lift off. But my concern is to find the play, if its excessive?