I got my center section this morning. Has Ford 3.70 gears in it. Came out of a 1969 F100, 300 6 cyl, 3 on the tree. I dont think its ever been messed with, the ribbing on these things make a good place for a mud dobbers nest. The bearings feel really good in it too, the other one I got, the bearings were shot.
I will clean this one up good enough to check the pattern and the back lash then pull the gears out of it. Then stick them in my housing and set them up right back like they were.