When I was taking the rear axle off the springs I noticed that this "brace" (for lack of better words) was positioned different from side to side.

https://picasaweb.google.com/113636046886857960240/Frame#5645716087685902098

You can see theres a thicker side. The previous shot is from the passenger and the thicker side faces the front of the truck.

On the drivers side, the thicker side faces the rear of the truck.

https://picasaweb.google.com/113636046886857960240/Frame#5645716055654362722

Does this matter?

Any tips for reattaching the axle to the springs?

Mark