I picked up a 12 bolt last weekend for my 40 3/4 ton.

I cracked it open and found out that it has 3.07 gears. This is great luck since I can use a Saginaw behind my 292 rather than figuring out an o/d.

But there's this oil tube that feeds into the top of the center section. What is that for?

Obviously all of my old 40 torque tubes didn't have anything like that.