PRG's upper control arm was designed after many hours of testing off-road. Greg Gagnon, owner and designer of PRG's products has been behind the wheel, under the trucks and inside the shocks of numerous race trucks. He knows how to create suspension components that work and valve a shock to any specification you could need. The unique heart shape design of the upper control arm is needed to properly allow the truck to achieve all possible droop travel. The truck now pushes 11 inches of wheel travel up front, nearly doubling the stock number. That puts smiles on our faces. The Aurora uniball that now replaces the stock balljoint connection in the spindle assures problem-free off-roading and reliability in a spot that normally fails over time due to hard use in the dirt.