Care to give some more inf like what exactly are you doing and what parts are you using etc. It looks cool, but I really don't know what you are doing. Jeff
Not exactly sure what you are wanting to know? As far as the project goes...
It's an 85 MJ, HP60 Frt, 10.25 rear, TPI305-Th400-doubler. Rancho 44044 front leaf springs and 4 link rear. Some pics of what I've got done are here.
If you're asking about the doubler its a chevy 203 range box mounted to a flipped dana 300. A guy off POR made the doubler adapter for me very reasonable compared to others on the market.