I haven't seen any mention of installing the transfer case end plate gasket #33179AA030. The bearings on my center differential (5MT) have gone noisy and it looks like the end plate was removed in the past (apprentice marks and lots of extra RTV). There wasn't a gasket in place when I took this apart, and no one seems to use it when rebuilding the differential. Does anyone have any insight as to when you should use it?