http://www.pscmotorsports.com/motorsport-specific-products/offroad/cylinder-assist-gears-kits-components/1-5-x-8-assist-cylinder.html 1.5" Bore x 8" Stroke x .625" Rod Uses 5/8"-18 rod ends. I got this in trade, but I am concerned about the .625" rod size. I'm running 35" tires with a locked d60 on a 6500lb rig in the rocks.