I would like to build a disc brake rear axle for my 80 Ford E100 wheelchair van. Can anyone direct me to what rear end to start with. Vans are 68" axel to axel! I don't know my trucks well enough to know what to look for to start with. Starting with a 68" van housing would be easiest , I think. I would like the thickest housing with 31 spline axels and 5 x 5 1/2" van bolt pattern, any thoughts on what years to look for?