Bought a Van......

What ratio rear?
I have a 12 vdc/115vac cooler that comes in handy for road trips.
Got two stories from the older fella... lol. He once said 3.86 and a 2nd time he said 3.68. LOL :D He gave me receipts a inch thick (no kidding) in a folder. I'll go through and find out. He put all new bearings/seals/sure grip/and ring & pinion in the rear axle.