where do these hoses go???

[Marlin]

I have never touched my manifold either! I do have an extra one laying around from an axiom somewhere in my boxes of parts...lol.

[Cobrajet]

I looked at my 2001, and the only hose I have in that vicinity is the breather line from the front diff. It terminates behind a small plastic shield. There is a similar breather hose coming from the drivers side front axle, but mine goes forward toward the radiator. Maybe somebody routed your breathers together and joined them at that point??

[Ldub]

Looks like trans breather(s) to me...