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  1. Mark80K15

    Why did GM route Circuit Number 30 Fuel Gauge to Tank Unit as they did?

    Hi, I'm using ST_352_80_1980_Chevrolet_Light_Truck_Wiring_CK_10_30_Only.pdf (don't know the actual title... the front page is not included in the PDF). Page 11 includes the "AUXILIARY FUEL TANK" schematic, and it illustrates circuits 30 and 53. Please see attached snippet...
  2. Mark80K15

    FREE Driver Side Gas Tank Sending Unit

    Hi, I'm giving away a Driver Side Gas Tank Sending Unit because I shouldn't have ordered it. It's brand new in the original box. Never been used. It was ordered from LMC Truck August 2023. It is LMC part number 32-4036. I should have ordered 32-4044 (and I've got that now). LMC says it's for...
  3. Mark80K15

    Dash cluster light - Electrical Circuit Number 8 question

    Hi, I have a 1980 GMC K15. My dashboard gauge cluster lights don't come on when I turn on the headlights. I've replaced the printed circuit on the back of the cluster plate but that didn't help. I did that because the current one looked pretty ratty. Then I found this thread that had excellent...
  4. Mark80K15

    Adapter between SM465 and NP205

    Hi all, 1980 GMC K15 with SM465 trans and NP205 transfer case. Trans and transfer case work fine, but when I get to 40 mph and higher the drivetrain sounds like it's rattling and shaking apart. I've never pushed it more than 60 mph as a result. Transfer case shifter also rattles like hell. it's...
  5. Mark80K15

    Please help with power steering box flush

    Hi all. 1980 GMC K15, 350. I am replacing the power steering pump and both lines. I have removed the old pump and lines. Can you please confirm if I should flush the old fluid from the steering box? If so can you please tell me the procedure? Do I need to install my new pump first? I saw a video...
  6. Mark80K15

    Vacuum connections

    Hello, I have a 1980 GMC K15 350 4bbl standard. I have a Rochester 4 bbl spreadbore carb. I have a couple questions about vacuum lines that are attached to it. The first is regarding the distributor vacuum advance hose. What is the module that is inline on that vacuum hose? It is circled in red...
  7. Mark80K15

    Remove front propeller shaft in order to drop starter?

    Hi all, need some mechanical advice. I have a 1980 K15 350 manual trans. I have unbolted the starter and disconnected the wiring. I was hoping the front propeller shaft wouldn't be in the way to pull the starter out, but I can't seem to move the starter down past the shaft. I also have...
  8. Mark80K15

    Which is the Correct Windshield Wiper Switch?

    Hi all, 1980 GMC K15. Pretty sure the wipers are running all the time because of a bad windshield wiper dashboard switch. That's because when I hold the switch in just the right spot (near the off position) they turn off. So I ordered the switch on the right in this picture from Classic Parts...
  9. Mark80K15

    Where do I run antenna wire through firewall?

    Hi, I need to run a radio antenna wire for my forestry road radio from the engine area through the firewall to the cab. I really don't want to drill a new hole in the firewall. Is there an existing hole I can use? The only hole I can see readily is the hole for the clutch pedal, but I don't...
  10. Mark80K15

    1980 K15 Step Bumper brackets and braces

    Hello all, thanks in advance for your help! I have a step bumper on my K15 and it is barely hanging on because it is only bolted to the angle brackets that attach to the bumper near the ends of the bumper. There are supposed to be additional brackets with one end that bolt to the frame and the...
  11. Mark80K15

    Outside door handle rod

    Hi all, thanks in advance for your help. I have a 80 GMC K15 and the drivers outside door handle does not open the door. The door opens fine using the inside handle. I removed the door trim pad and found that the outside door handle rod is just hanging from the handle. It is no longer attached...

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