freshly welded diff backlash advice?

[dreamin240sx]

hey guys i just put another welded diff in my s13. i had a problem before where the diff made a loud popping noise when making a turn or shifting. well i figured the old welded diff was just worn out since it had over 250xxx on it when i got it welded. so after i put the new one in its doing the exact same thing!!!! now what im asking is could it be because the backlash isn't set right? and if so can somebody explain how to get it right. i've done one a long time ago but for some reason my brain went into retard mode and now i just start second guessing myself so i'm just needing some refreshing. i have search quite a bit but i keep coming across lsd shit. so please any help would be great maybe some pro pointers so i dont run into this problem again.

Also i'll just give you guys my mod list so maybe theres something else i need to look over again.
s13 hatch
rb25det
isis solid subframe bushings
circuit sport upper control arms
welded diff
megan coils

thanks for all the help guys