[jeremy]

Its on My 2002 Superduty transfer case, in front of the 4x4 "motor".

 

[norm]

drain plug?

 

[466 Gasser]

There's a detent spring and ball under it. # 7,8,9, and 10

 

[jeremy]

There's a detent spring and ball under it. # 7,8,9, and 10

Hmmm. I wonder if it puts tension on the drive chain inside the case? or if it has something to do with the shift linkage in there?

 

[White Lightning]

It's a detent for the shifter fork. #77.
Rob