Originally Posted by shenrie
sorry, I cant remember... does advanced use coil or leaf springs?
regardless an oil relocation kit would likely be your safest bet. that way even if you did end up accidentally compressing the suspension more than usual, you wouldn't have to worry about it connecting with the hoses or filter.
Looks like leaf to me from the right side of the photo.
Unfortunately your differential is just lining up perfectly with the lines and as soon as you hit a big bump its shoving your driveline up into those lines. Not sure if that's what you were asking when you asked what is happening here but that's what's happening.
I would definitely look into relocating that. Or you could just tighten the zip tie...
... But seriously, it doesn't look like there is much you can do other than relocate it.
Edit - you could always do what I did and put a different axle under there, but that gets expensive.