[Buffalo4]

I don't know about those parts but have someone check your motor mounts.
Is your CRV a 4WD? If so, it is probably due for a rear diffy fluid change. Use only Honda DP-2 fluid if you do it.
Research it more. Good writeups in these forums.
Online Honda parts dealers, such as Bernardi http://www.bernardiparts.com/?gclid=CJKy9ua6-c8CFQ-dfgod2pEKVQ often have diagrams to help identify the parts. Many others out there.
Buffalo4
PS: Your profile shows an '02 CRV.

 

[Buffalo4]

If your CRV has a driveshaft, it is a 4WD model, unless someone removed the driveshaft.Since you say it has a rear differential, then it is a 4WD.
If you don't know when the fluid was changed in the rear diffy, change it. It takes just over 1 qt of Honda DP-2 fluid and it fairly easy to do. Look in the Sticky Notes for writeups on doing it. There are also good youtube vids on it,
Sorry, but I cannot help you on your other questions.
BTW, if you hear a rubbing or screeching type noise while doing slow tight turns, it is usually an indication that the rear diffy fluid needs to be changed.
Buffalo4

 

[Buffalo4]

Sorry, I can't help you with your question about parts. Perhaps someone else in this forum will help out.
The rear wheels get power when they are turning slower than the front wheel (s).
Buffalo4