3rd member swap advice
This is exactly what I planing this month as well. I have 3.23 open dif, I have located a 3.91 sure grip to replace that.
I am sure the 3.91 may be a bit harsh on the highway but I think I am handle that not prob. Especially with all the street advantages it offeres.
I can't wait to feel the "seat of the pants" the 3.91 offeres.