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  1. 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...
  2. 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...
  3. 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...
  4. 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
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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.
  10. 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...
  11. 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...
  12. Mark80K15

    Adapter between SM465 and NP205

    Hi everyone, that totally resolves my questions. You provided excellent explanations and advice, thank you! I'll see if I can provide pictures as I move through this. I haven't decided if I'm dropping the transfer case, if so that may provide more opportunity for better pictures.
  13. Mark80K15

    Adapter between SM465 and NP205

    I thought I would include the only 2 pictures from the manual that refer to the adapter. One of the adapter pictures shows the driver's side of the adapter (the rest is cut off!) and there appears to be a bolt hole on the driver's side, indicating there should be a mount there (seems to be...
  14. Mark80K15

    Adapter between SM465 and NP205

    Hey, sorry to carry this on, but I still need a little more info. Now that I've pulled the x-member out that the adapter sits on, I only have more questions. Attached are 2 pictures of the x-member out of the truck with the one mount in place. On both pictures, the left is the passenger side...
  15. Mark80K15

    Adapter between SM465 and NP205

    Thanks very much, bucket. I appreciate it.
  16. Mark80K15

    Adapter between SM465 and NP205

    Hey bucket, thanks a lot for the advice. I'll get the rear driveshaft checked out. And thanks for the confirmation regarding the bell housing. Is it correct to say that the trans/transfer case are not directly bolted together, rather, there is an adapter between them, and the 2 mounts bolt to...
  17. 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...
  18. Mark80K15

    Please help with power steering box flush

    Ok, gotcha, thanks everyone!
  19. Mark80K15

    Please help with power steering box flush

    Ok, cool, thx for the quick reply. Any idea what is the total fluid capacity of the whole system (pump, box, lines, no cooler)?
  20. 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...
  21. 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...
  22. Mark80K15

    1986 Square body K10

    Hi all, I looked for a description on how to adjust the doors in these forums but couldn't find it. I did put PEX on the strikers and it improved things, but I still have to slam the doors too hard for them to completely close. They do completely close when I do that. Before I change hinge pins...
  23. Mark80K15

    Remove front propeller shaft in order to drop starter?

    Thanks for the advice Goldie Driver. Um, I should've put more effort into removing the starter and less into posting this thread. I was trying to remove the starter by dropping down between the driveshaft and the oil pan. Wouldn't fit. After writing this post I tried again and this time it...
  24. 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...
  25. Mark80K15

    Which is the Correct Windshield Wiper Switch?

    Just to confirm, I installed the pulse-type wiper switch and it works fine. Nice to have wipers and washer back. Thanks for your help everyone! Mark

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