Thanks for replying, gentlemen,

Sure grip391; You mean that the snap ring should be behind the brake backing plate (on the axle housing side or inside of that plate)?
Cab: You mean that the snap ring is to be on the outside of the brake backing plate?
I am still confused.
I wrote dr diff this morning for clarification. Don´t know when they will reply, so if any of you is absolutely sure of where the snap ring should be, please don´t hestitate to write a reply.