NP 208C vacuum lines?

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LJ Squarebody

Junior Member
Joined
Nov 6, 2025
Posts
7
Reaction score
14
Location
Lake Jackson, TX
First Name
Doug
Truck Year
1984
Truck Model
K-10
Engine Size
350
Hello, first time question on here. I recently acquired an 84 K-10 and me and my son have been going thru it from the ground up making it into a daily driver for him (15yr old) I am pretty inexperienced as far as the vacuum system in general and all of this stuff if I am honest. The EGR has been deleted and the vacuum canister in the driver side front is disconnected. I thought i read somewhere that there are supposed to be vacuum lines going the T case but I don't see any. I do see what seems to be the 4wd light wiring that i have read about it other posts. Can anyone confirm if these vacuum lines need to be there or not?

Thank you and I appreciate any help i can get. I have to hand it to you guys who work on these trucks. You have to be a jack of all trades, skills to keep these old trucks running good! Me and my son are learning a ton.
 

dusterdude

Full Access Member
Marine Corps
Joined
Oct 7, 2020
Posts
510
Reaction score
657
Location
US
First Name
mark
Truck Year
1985
Truck Model
gmc c15
Engine Size
305
If your 208 is like the 208 in my power wagon,it will have either a 4 port vacuum switch(mine did) or an electrical switch(which i changed to).in other words,i got rid of the vacuum crap.
 

Ricko1966

Full Access Member
Joined
Apr 11, 2017
Posts
10,175
Reaction score
19,672
Location
kansas
First Name
Rick
Truck Year
1975
Truck Model
c20
Engine Size
350
Hello, first time question on here. I recently acquired an 84 K-10 and me and my son have been going thru it from the ground up making it into a daily driver for him (15yr old) I am pretty inexperienced as far as the vacuum system in general and all of this stuff if I am honest. The EGR has been deleted and the vacuum canister in the driver side front is disconnected. I thought i read somewhere that there are supposed to be vacuum lines going the T case but I don't see any. I do see what seems to be the 4wd light wiring that i have read about it other posts. Can anyone confirm if these vacuum lines need to be there or not?

Thank you and I appreciate any help i can get. I have to hand it to you guys who work on these trucks. You have to be a jack of all trades, skills to keep these old trucks running good! Me and my son are learning a ton.
Is this truck a 305?
 

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