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  1. Mark80K15

    Wrong brake calipers?

    I just went through the same thing. I got it resolved. Yes, there is a Right and Left fitment, and yes, you can tell because the bleeder must point up. Also note the calipers fit either 2WD or 4WD, not both. My truck is 1980 K15, so I got calipers for 1980 4WD. This is the same style as @AZ...
  2. Mark80K15

    Changing front rubber brake lines. Where’s the inner clip?

    Detail of the clip on the outside of the frame. The replacement hose should have that clip installed, and you don't do anything with it.
  3. Mark80K15

    Changing front rubber brake lines. Where’s the inner clip?

    I found this post because I had the same question: where are the clips on both sides of the frame? I needed to know how to disassemble the old brake line (from the caliper to the frame rail) without damage. I don't think that has been answered in this thread. There is a clip on the brake hose...
  4. Mark80K15

    FREE Driver Side Gas Tank Sending Unit

    Just a reminder to all, the gas tank sending unit I described in this thread is still available for free.
  5. Mark80K15

    1978 Scottsdale Drag Link Question

    One more picture:
  6. Mark80K15

    1978 Scottsdale Drag Link Question

    I just installed a 2" ORD lift and used their drag link (Factory Push/Pull Steering with Jam Nuts, SKU U9015-S4.75), the Moog drag link ends ES2026R and ES2027L, and their 2" Drop Pitman Arm (SKU CA50-I). I thought I'd add some pictures to show how the assembly went together, and the angle of...
  7. Mark80K15

    Dash cluster light - Electrical Circuit Number 8 question

    Wow @AuroraGirl , that's very helpful! I had no idea the codes on the SPID label are the ones found on the GM 1980 GMC Service Manual (attached "fuse_block_diagram.JPG"). Thanks! And thanks for the @chengny post, it helps. I still need to know which orange wire that is that goes to the terminal...
  8. Mark80K15

    Dash cluster light - Electrical Circuit Number 8 question

    Ok, thanks a lot @AuroraGirl . To answer your question, no, I don't have roof lamps.
  9. Mark80K15

    Dash cluster light - Electrical Circuit Number 8 question

    Hi @AuroraGirl , thanks a lot for posting that. I attached a pic of my fuse box ("fuse_block_picture.JPG"). It has a few wires removed for clarity. I left one orange wire which is for the courtesy light. There was never anything plugged into my LPS terminal. As you say you have a 1212 orange...
  10. Mark80K15

    FREE Driver Side Gas Tank Sending Unit

    Hey @BRetty , nice to hear from you. Please let me know when you'd like to arrange something.
  11. Mark80K15

    FREE Driver Side Gas Tank Sending Unit

    All I know is what it says in the LMC manual. They are parts 32-4036 (73-79) and 32-4044 (80-89). They are both drivers side and both 3 outlet. The diameter opening is the same as I can see. Please see attached picture of 32-4044 (and compare to above picture of 32-4036). I'd say the position...
  12. Mark80K15

    Reverse light power...

    Yep, I'm talking about the green and blue pair of wires in your first picture. You illustrate where they enter the cab and go up and then to the right. In my case, they continue to the base of the steering column (inside the cab) and then disappear in the harness there (that moves away from the...
  13. Mark80K15

    1977 C30 Fuel Gauge wiring

    I'm posting pictures of my firewall bulkhead connector to support my post above. It looks like the bulkhead is different on my 80 K15 than the 77 C30 that @Timtom posted, so this won't really do @Timtom any good, sorry. My Circuit 30 is the wire in the bottom left, which looks to me kinda...
  14. Mark80K15

    1977 C30 Fuel Gauge wiring

    @Timtom if you're still working on this I might have a bit of insight. You're asking about the solid tan fuel gauge wire. Yes, it is Circuit 30 on your diagram and it originates at the dashboard fuel gauge. It proceeds out of the firewall bulkhead connector (more on that later) and joins the...
  15. Mark80K15

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

    Thanks a lot, @mtbadbob and @RanchWelder . I appreciate the kind comments. So do I understand @RanchWelder correctly, that for a dual tank configuration, there's no reason for Circuit 30/30A to run all the way to the fuel tank area? And that's because the only function of Circuit 30 and Circuit...
  16. 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...
  17. 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...
  18. Mark80K15

    Reverse light power...

    On my 1980 GMC K15 manual 4-speed, I have the reverse switch out the left side of the trans, near the top/front. There are a pair of wires coming out, one green, one blue. Here they are from ST_352_80_1980_Chevrolet_Light_Truck_Wiring_CK_10_30_Only.pdf: They are circuit 24 (light green, Back...
  19. 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...
  20. Mark80K15

    Yukon Grizzly Locker MUST READ

    Hey @Fastduramax , how did it turn out with the Grizzly Locker? Did you install it? Front or rear diff or both? How is driveability? Good on the paved road at all speeds? How about on rough terrain? I'm looking for a locker for my 1980 K15 SM465/NP205 long box, for both the rear GM corporate...
  21. Mark80K15

    73-87 (91) Fleetside Tailgate Mechanism Repair

    I just did my tailgate. I used LMC parts. I replaced the tailgate handle (part 38-6622), the latch rods (38-6633), and the left and right latch assemblies (30-1546 and 30-1547). Once the latch assemblies and tailgate handle are roughly in place inside the tailgate, the next step is to insert the...
  22. Mark80K15

    Adapter between SM465 and NP205

    A bit of cautionary advice here: during this project I pulled the engine. I forget if I mentioned that earlier in the post. At this point the NP205, adapter, and SM465 are all bolted together, and earlier this week I installed the engine. Just before installing the engine, I noticed that the...
  23. Mark80K15

    Replacement electric external fuel pump suggestion?

    Thanks @drumvirt
  24. Mark80K15

    Can you run Schaeffer 50W oil in a SM465?

    Thanks @metal tech , can you please tell us what grade of oil you used?
  25. Mark80K15

    Replacement electric external fuel pump suggestion?

    My engine is a 1980 350ci with a Holley 600 cfm vacuum secondary carburetor, electric choke. I got a Mr. Gasket #12S electric fuel pump (I haven't installed it yet). The package clearly states "A fuel pressure regulator is highly recommended". On Mr. Gasket's website, the "Shop by Vehicle" is...

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