Search results

  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. Mark80K15

    Replacement electric external fuel pump suggestion?

    Thanks @drumvirt
  7. Mark80K15

    Can you run Schaeffer 50W oil in a SM465?

    Thanks @metal tech , can you please tell us what grade of oil you used?
  8. 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...
  9. Mark80K15

    Adapter between SM465 and NP205

    Ok thanks @bucket, that's good info. I suppose either configuration is structurally the same...
  10. Mark80K15

    Adapter between SM465 and NP205

    Thanks @bucket! When you say “a means of giving the bolts more room to stretch”, do you mean that the spacers from the factory (installed between the top of the frame and the nut) allow the bolts to be longer than they would be without the spacers? Ok other words, the spacers come from the...
  11. Mark80K15

    205 transfer case brace

    I'm probably going to complicate things here, but it just so happens I recently had my crossmember out from my 1980 GMC K15. It's different than what @nvrenuf illustrates. I guess I can't guarantee the frame/crossmember is 1980 (even though the cab is 1980), but it is 1/2 ton. Here are some...
  12. Mark80K15

    Adapter between SM465 and NP205

    And finally, another question. See the spacers between the top surface of the crossmember and the frame? Is that correct? I'm pretty sure that's how it was when I took it apart, but of course I didn't take pictures and of course I don't remember for sure. Can anyone confirm if they have the same...
  13. Mark80K15

    Adapter between SM465 and NP205

    A few more pix...
  14. Mark80K15

    Adapter between SM465 and NP205

    When I started this thread, I had a lot of questions regarding how SM465/NP205 are supported and bolter together, how the adapter between them works, how the mounts underneath the adapter are aligned, etc. Today I reinstalled the crossmember and adapter, then I bolted NP205 to that. Worked like...
  15. Mark80K15

    Adapter between SM465 and NP205

    Offroad Design confirmed that I have the seal installed properly (the one I mentioned above on May 10), and assured me that gap between the adapter and SM465 will be adequately filled by the gasket in their kit. I finally got the coupler (from Advance Adapters) that @bucket shared in this...
  16. Mark80K15

    Can you run Schaeffer 50W oil in a SM465?

    Actually, that's what I wound up getting. Partially because Amsoil has an excellent reputation, partially because when using the Amsoil website and specifying "1980 GMC K1500 4WD PICKUP 5.7L 8 -cyl Engine [L]" and "For Manual Transmission: 4-SPD GL-5 All TEMPS 80W-90,80W", it tells me to use...
  17. Mark80K15

    Can you run Schaeffer 50W oil in a SM465?

    I found an short post outside of GMSquarebody.com that states "most GL-5 lubes are now compatible with yellow metals IF it has a rating of "MT1". Early GL-5 lube may have been corrosive, but, most of the new GL-5 lubes have counteractive agents to any sulfurs that reside in the oils". This post...
  18. Mark80K15

    Can you run Schaeffer 50W oil in a SM465?

    I don't want to reproduce a pic from an existing post, so here is the link, look for the @AuroraGirl posting on Oct. 9, 2021: https://www.gmsquarebody.com/threads/2wd-sm465-speedo-gear-problems.34653/page-3
  19. Mark80K15

    Adapter between SM465 and NP205

    Ok, next question. There is a seal that goes inside the rear of the adapter, where the adapter bolts to NP205. The seal is here: https://www.offroaddesign.com/sm465-figure-8-np205-adapter-reseal-kit.html After installing that seal, I placed the old coupler inside the adapter, and bolted the...
  20. Mark80K15

    Can you run Schaeffer 50W oil in a SM465?

    So, it sounds like the consensus for SM465 is SAE-80W-90 GL4. But @AuroraGirl posted a picture from the 1980 owners manual on Oct 9, 2021 in the "2wd SM465 Speedo Gear Problems" forum, which shows SAE-80W-90 GL-5, or in Canada (like me), use SAE-80W GL-5. Why does the manual specify that if GL-5...
  21. Mark80K15

    76 K10

    I'm working on the gaskets and seal on my sm465 to np205 also. Here's a kit for them: https://www.offroaddesign.com/sm465-figure-8-np205-adapter-reseal-kit.html Looking at that kit, when you say you've replaced seal at adapter, do you mean the right side gasket or the seal? If both that seal...
  22. Mark80K15

    Adapter between SM465 and NP205

    It turns out that Advance Adapters has the coupler as @bucket suggests. They say they'll have them in stock in late May. And now Offroad Design also says they'll have them in late May! For everyone's reference, here is the coupler from Advance: https://www.advanceadapters.com/5174 Earlier in...
  23. Mark80K15

    Outside door handle rod

    Thanks for the video, tadslc. It adds to the knowledge in this thread. I'm still good with my bailing wire fix, two years ago.
  24. Mark80K15

    Adapter between SM465 and NP205

    Bucket was kind enough to include a reference to a source for the coupler above, from Off Road Design. I was going to buy one but Off Road says they are having problems sourcing it. Does anyone know where else the coupler might be available? Here is the reference Bucket provided again...
  25. Mark80K15

    Adapter between SM465 and NP205

    Looks like the bolts from both the left and right side mounts are broken and the remnants are stuck in the t-case adapter holes. Any suggestions on getting them out? There is no bolt sticking out the bottom of the adapter, but there is about 1/2" sticking out the top. Also, there are 8 bolts...

Latest posts

Forum statistics

Threads
44,168
Posts
950,780
Members
36,283
Latest member
Cantrell299
Top