So what actual rear end will hold the best gears for a T5 swap? I have a 1948 Suburban with 3 on the tree. My goal is to go 65 to 70 comfortable and still have the stock width if the rear axle. I live in a relatively flat area with some rolling hills. Of Madison Wisconsin. I may even swap in a larger chevy 6 cylinder like a 292. Any suggestions on a T5 with a 292 and which rear axle?

Not sure what my rear end is now. I assume 3.90