question about moser 8.75 axles...

Hey All:

Long story short, is there something I'm supposed to remove from the stock center section when installing Moser 8.75 axles?

I guess there's something in there that puts preload on the bearings that the Mosers don't need?

Will the new axles actually fit in the housing with that installed and its really bad to have it in there, or will they just not go in at all?

Thanks

Steve