To day I'm installing some 2 1/2" over leaf spring assist helper springs Part number AC111030 made by autocraft on my 2007 Chevy express 2500 cargo van. I'm using this van to tow a 32 foot jayco Jay flight and want to improve my ride hight and reduce the stress on my leaf springs. I made the video step by step and lost the video so I re made this video with only an explanation.