This may help you guys my pops built his 4Runner with the 12in shackles under the frame and ran it and started to complain of bottoming out I told him the leafs need a rebuild he went to DeAver and DeAver told him f67s are to light of a spring for the 4Runner they need to be the hd pack so DeAver made it an hd pack and my pops said the truck handles 10x better than ever before with no shock changes and when he does camping the springs barely sag now.
