Glad to see you have more responses than I did. (1) I ordered my 4:10's from Dr Diff. $199 to the door for Richmonds gears. I'll get back to the thread after the install.
For those interested, Dr Diff's Richmond 4:10 gears were in installed and they are perfect. No whine at all. Richmond recommends 500 miles of easy driving for break in. Don't think I'm going to make it. More like 10.