I have a dana 70 4.56 and up trac lock if you want to do the Jana 76 conversion. It uses the 10.5" ring gear in the 60 housing. Worth the extra 150.00 for the special bearings to install it. Never have to worry about breaking a ring gear. You might also look at using the Jeep ends, if you want a factory rear disc brake for less than $100.00. The Ford Explorer uses the same rear brakes as a Jeep Grand Cherokee but with the ford metric bolt pattern. The jeep uses a Timken set 10 which has a 1.562" ID and the 35 spline gears are 1.5" O.D. Just some food for thought. Tim