The quad's are suppose to prevent wheel hop, and help keep the axle planted, I took them off of my 91 but have never taken them off any 94-98 I've had. On my 91 I had other parts on the rear and I wanted to run 315's on the back at one point in time and the quad's were in the way so they had to go.
They are there for one reason and one reason only. Wheel hop or "axle wrap." The stock upper and lower control arms are made of stamped steel so they will flex and deflect ALOT causing wheel hop. Quad shocks are there to slow this down. Get a set of boxed or tubular...pretty much any aftermarket control arm and it will eliminate the need for quadshocks entirely.