[HyperFX]

Originally Posted by b4pete

The heads on my front ones point up, the rear ones, down?!?!

And your ring gear is to the left of the front diff? Your rear diff has the ring gear to the right?
The screws only thread into the top housing, and will "push" through the bottom housing. I'd double-check to make sure it's secured properly. Could be the only thing holding your front diff housings together is the bulkhead (gear plate), and cover. (That is, if the ring gear is to the left, and screw heads are on top.)