Ive been dreading breaking these bolts, and busting my knuckles and skull.... To my surprise the bolts on the passenger side front leaf broke free w no problem (god bless pb blaster, its a miracle in a can)...so, everything that i read instructed me to remove the tires and support the frame with jack stands and the axle with a floor jack underneath the differential pumpkin!! I thought... dont the tires and wheels support the axle already? Turns out that they do so i left the tires on!! also made me feel more safe! i decided to do one leaf at a time and used my hi lift under my front bumper to raise the frame off of the axle, the tires were never completely off the ground and it felt extremely stable the whole time! the u bolt bolts were a bit tougher so i easy cut them off with the sawzall.... NOTE: before cutting the u bolts i used your basic scissor jack to support the leaf spring plates and slowly lowered it once all 4 were cut!