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  1. Mark80K15

    Can you pls identify this distributor wiring harness?

    Well, I still don't know if my harness is an Electronic Spark Control or a module to operate an idle speed return solenoid. It's been a few years since I removed the Rochester carb, so I don't remember if the harness was hooked up to it (if so, it would be the latter). In any event, the engine...
  2. Mark80K15

    Can you pls identify this distributor wiring harness?

    Ok @bucket , thank you sir. I'll report back on what happens when I remove it.
  3. Mark80K15

    Can you pls identify this distributor wiring harness?

    Hey @bucket thanks for the info. Can you please tell me anything else about the egr speed switch? I don't know anything about it, and would like to know if I need it or not. I hope I can discontinue using it. I'm a little reluctant to simply remove it and keep driving...
  4. Mark80K15

    Can you pls identify this distributor wiring harness?

    I looked a little harder and found this discussion, and it might have my answer (my harness is an Electronic Spark Control). But it doesn't have any pictures, so can someone please verify my post above with the pictures I posted? https://www.gmsquarebody.com/threads/bypassing-esc.9479/ And no...
  5. Mark80K15

    Can you pls identify this distributor wiring harness?

    Hello, 1980 GMC K15 350 4-bbl, aftermarket Sun tach. There is a wiring harness that plugs into the HEI 12V/tach port. Can you please tell me what this harness is? The 1st picture shows a 12V orange wire (power for distributor) with a male white plastic terminal and white tach wire with a spade...
  6. Mark80K15

    Tightening down front yoke nut stops NP205 from turning

    Hey @Blazerbiker , that makes a lot of sense. Thanks for the explanation. If you are who I think you are, ORD rocks! Gonna try out my new zero rates next week, order #42468.
  7. Mark80K15

    Tightening down front yoke nut stops NP205 from turning

    Hi @H2OnSnow , yes, I looked at the service manual. One reason I decided not to seat the seal fully in it's bore is because before I touched it, the seal was not fully seated in the bore. Instead, the seal was seated so that the top of it was flush with the top of the housing. The other reason...
  8. Mark80K15

    Tightening down front yoke nut stops NP205 from turning

    Sorry @bucket , I wasn't clear before. When I said everything locked up, I meant only when the front output shaft is engaged (4H and 4L). The input shaft or rear output shaft were never affected by this problem. Hey @Craig Nedrow , I didn't replace anything that is different than stock, other...
  9. Mark80K15

    Tightening down front yoke nut stops NP205 from turning

    So when the yoke is tightened on when the seal housing is present, the yoke dust cap contacts the seal enough that it actually stops the front output shaft from turning. Did not expect that! I installed the seal so that its face is flush with the top surface of the seal housing., same as @8:45...
  10. Mark80K15

    Tightening down front yoke nut stops NP205 from turning

    Trying to find the problem, I removed the seal housing from the front output shaft, and put the yoke back on. I wanted to see what would happen if I tightened the yoke on with no seal housing. I tightened the nut to 60 ft-lbs, and everything still turned properly! So clearly there's a problem...
  11. Mark80K15

    SM465 shift rail position to install shifter, or top plate

    Hey @PrairieDrifter , your comment is regarding the position of the rails when removing/installing the lid, not the position of the rails when removing/installing the shifter, correct?
  12. Mark80K15

    Tightening down front yoke nut stops NP205 from turning

    Hi all, I still need help on this, if anyone has a similar experience.
  13. Mark80K15

    SM465 shift rail position to install shifter, or top plate

    Hi, I just wasted a bunch of time trying to get the shifter back into SM465 properly. It kinda went in, but wouldn't shift anything. Eventually I got it in properly, and thought I would document what worked for me for other's benefit: It's all about the position of the shift rails. The pictures...
  14. Mark80K15

    Tightening down front yoke nut stops NP205 from turning

    Yeah thanks. In fact the GebBuilt videos are what gave me the courage to proceed. Since he just became a member, I’d sure like to talk to him… Anyone know how to reach @GebBuilt?
  15. Mark80K15

    Tightening down front yoke nut stops NP205 from turning

    I confirmed that for each NP 205 driving position (4H, 2H, N, 4L), the rail position was correct, and the input/output shafts turned properly. For example, N has each shaft turning (or stationary) independently, 4L has input turning twice for every front/rear output turning once, etc...
  16. Mark80K15

    Tightening down front yoke nut stops NP205 from turning

    Hello, 1980 GMC K15 SM465/NP205. I broke the SM465/NP205 adapter, so I took the time to apply new NP205 seals/gaskets and the JB Fab twin stick setup. I didn't intend a full rebuild, but I wound up removing everything except the idler gear assembly. In fact the front shaft just kinda fell out...
  17. Mark80K15

    NP205 shift rail help!!

    Hi Kit. Did you ever complete this? I'm asking because I'm about to do the same thing to mine, in order to install twin stick shifters. That requires modified shift rails. I don't have any advice to give you yet, but I can say there is an excellent video by the twin stick manufacturer that...
  18. Mark80K15

    Looking for a NP205 shift knob 4LO N 2HI 4HI

    Hello Cris, have you had any luck yet?
  19. Mark80K15

    Anyone running wipers bigger than 16" oem?

    I found the ANCO 48-12 Wiper Blade to Arm Adapters. The URL for them that I posted April 7 no longer works. All I can say is I found them at a Gilbert Supply store in BC. They also carry the Bosch Clear Advantage blades. We tried to install the adapter to the blade right on the counter. Didn't...
  20. Mark80K15

    Anyone running wipers bigger than 16" oem?

    I would have liked to get the ANCO adapter that @Turbo4whl suggested yesterday, but that website wants $92.57 USD shipping to British Columbia. Not doing it. ANCO customer support confirmed they do not sell these adapters separately. ANCO's documentation for their 16'' 7mm Bayonet Beam Wiper...
  21. Mark80K15

    Anyone running wipers bigger than 16" oem?

    Thanks very much everyone, I'll check out the link @Turbo4whl provided. And I take it 18" aren't a problem based on comments earlier in the thread (I did see the comments regarding a weak wiper motor).
  22. Mark80K15

    Anyone running wipers bigger than 16" oem?

    I've lost too many wiper blades from my 1980 GMC K1500. After reading this thread, I'd like to keep my original bayonet style arm. I think I'd like to: - Use the J-hook adapter that @bucket suggested - Use 18" Bosch Clear Advantage wiper blade Can you please help with my questions? - Does...
  23. Mark80K15

    Driver Side Gas Tank Sending Unit no longer available

    Sorry, no longer available.
  24. Mark80K15

    Let's see those 4x4 Squares On Dirt!

    Some snow, some dirt here in Sicamous, British Columbia
  25. Mark80K15

    No driver's side rear turn signal or brake light, because no power at bulkhead

    Ok, got a happy ending. I tested for continuity from the firewall side of the connector (at the steering column) to the bulkhead in the engine side of the firewall, and there was continuity (thank god). Then, with that connector disconnected, I switched to IGN on and was going to jump #19 Dk...

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