What about using the A body after market 28 inch axle and having it drilled for a 4 inch pattern. That would give you the same axle spacing as a B or E body axle with a small bolt pattern.
I would but the a body axles I have currently are 30 spline and they already have the green bearings pressed on them, The axle housing is from an e body that was shortened to a body spec. Would the Dr. Diff rotors work with 07, liberty hardware? Seems the hiccup is the offset and rotors in 4" that size. From the readings i found, basically explaining Im Fubar. But i have also seen variants on ebay that got for 400$ ouchy. Just want to have rear disc, in future and will use stock rims and then size up to 15" rallee rims and still have 4" sbp. No possible? Really way down the line i was hoping for a Jeep/mopar ABS System.