4 link suspension problems

I have a friend that to an 87 4runner and put 4 link suspension he made everything his self he has 14 inch travel king coil over shocks his coils are rated 200 and 350 I believe . He is having issues with his rig tilting on him especially on side inclines feels like it's going to roll over here's a pic. Any feedback would be hhelpful he is running 35 inch tires now but planning on 39 in near future.

 

Here is another pics. We were wondering if his springs don't have enough wieght if the is causing it he's putting sliders bumpers a role age and winch on eventually as well

 

I can't help you with the issue, but something definitely does not look right there.

 

looks like he needs more spring rate. from my non 4 link, somewhat coilover knowledge.

is the coilover actually compressing when he does that?

 

with a 4 link you don't have a track bar or panhard bar to help with alignment and locating the axle to the body and vice versa, so the springs are responsible for keeping the body in check relative to the axles. i would agree that spring rate is the issue, and the springs on it currently are far too soft

 

His coils are compressing yes. Thanks guys I appreciate the tips.