I have no idea yet. The fronts were/are ProComp ES3000s. As far as bump stops, I dont know yet. But Im doing next years tuff truck and going bigger! So, air bumps are most likely what I need. Shoot, might be linked with coilovers by then. I did take out the bottom spring in the pack, Im sure that is why they are so soft. I already have some 3/8 tabs I got from Kert at Diy4x a while ago. We be putting those on this week. I pressure washed the burb for 3 hrs. yesterday and I have about an hr. or so left to do!