Hi and thanks for using 2CarPros. Com.
Honestly, there are no vacuum lines going to a manual transmission on this truck. Are you sure it is not going to the transfer case? The vacuum harness does run across the transmission to the transfer case. Take a look at the attached picture and let me know if that is what you are looking at on the truck. Also, if you look at the second picture, it is the entire vacuum schematic. Vacuum to the transfer case comes off the rear of the throttle body.
Let me know if this helps or if you have other questions.
Joe
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Friday, August 31st, 2018 AT 8:01 PM