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  1. Bextreme04

    1986 K10 Cutting off When Put in Gear

    My first thought is that the torque converter has the lockup clutch frozen up or being commanded engaged... but since the OP only joined and created this thread, then hasn't been seen since, I bet he either figured it out himself or gave up on it.
  2. Bextreme04

    What is this 2 prong Plug above the oil filter?

    It wouldn't be original in a '76 model year though. You would still have the manifold mounted thermostat spring in that year, then it switched to a hot air choke into the early 80's, then an electric choke somewhere in the mid-80's I think.
  3. Bextreme04

    What have you done to your square lately??

    I have a converter in my 6L80 from PTC in Auburn, WA. It's been holding up well and made a big difference over the stock one and the first rebuilt one I had in it from a company in Portland. The local speed/transmission shop here used them exclusively and said he rarely had any issues with them.
  4. Bextreme04

    Towing with my 86.... hints, tips, essentials?

    Oh, and it has 4.10 gears and 35x12.5" E-rated tires
  5. Bextreme04

    Towing with my 86.... hints, tips, essentials?

    I tow my family travel trailer a few times a year with my square. For family trips I use my newer suburban with a 6.2/6l80 and a tru-cool 40k. When I’m hunting or camping solo I will take the square. Weight is almost identical to your except with a load leveling hitch and electric brakes on both...
  6. Bextreme04

    Nice squarebody on BaT

    Says they had it listed in November 2024 and didn't sell it. Let it bid up to $25k and that wasn't enough, but now listed with no reserve? Odd choice... we'll see what it sells for. Beautiful truck in amazing condition
  7. Bextreme04

    Post 454 rebuild and oil consumption

    Hmmm... interesting that there is no carbon buildup on the plug itself. There is a lot of oil on those threads though. How many miles do you have on the build now? As others have said, I'd be running it hard at this point to try and seat the rings. Medium to heavy throttle up to ~5k rpm and then...
  8. Bextreme04

    Post 454 rebuild and oil consumption

    I can't imagine a situation where an engine loses that much oil and doesn't smoke like a SOB or leave a LARGE puddle of oil everywhere it goes. My truck leaks a bunch, leaves lots of drops of oil everywhere I park... whole underside near the engine has oil on it.... maybe 1 quart every few...
  9. Bextreme04

    What have you done to your square lately??

    Never mind on my previous post. I looked it up and it is a timed unit, not a solid state proportional. Funny enough, it is a rebranded Tekonsha unit according to the Reese website. https://www.reesetowpower.com/product/8507120_trailer-brake-control-timed
  10. Bextreme04

    What have you done to your square lately??

    I hope you read the instructions, because most modern solid state proportional units still call for them to be mounted level in at least one axis. The software design is somewhat lacking and it makes it MUCH easier to design the solid state algorithms if they are constrained. I highly recommend...
  11. Bextreme04

    241c or stay with the np203

    No, all of the issues and changes were pre-97 where these were installed on 350's, 305's, and v6's. He will want to stay away any early 90's 4L60 as they were still working things out in those years. He'll know it's the right one because it will have the LS bellhousing on it with the additional...
  12. Bextreme04

    241c or stay with the np203

    The problem is going to be finding a 241c with a passenger side drop. The most likely candidate for you, and the easiest to find, will be a NP208 from an automatic trans equipped 85-90 K10. They are all round pattern and will bolt right up to a 4L60. The 0411 from the 99 will run a 4L60 no...
  13. Bextreme04

    Spark plugs

    the second number is the heat range. Higher number is hotter plug. A CR43TS, CR44TS, and CR45TS will all fit and work in most GM V-8 engines from the late 60's through the 90's. 43 will be a colder plug, this means it will dissipate heat away from the tip of the plug faster than a 44 or 45. If...
  14. Bextreme04

    489ci tow build...

    Oh, and checking on a compression calculator... my L29 after the rebuild should be ~9.15:1 Static compression ratio and ~8.4:1 dynamic with this cam. It is right on the borderline of what is considered safe towing compression ratios for an iron headed big block, but I also have the benefit of...
  15. Bextreme04

    489ci tow build...

    Factory L29 and 8.1L are in the 9.0:1 range with the factory fast burn iron heads. You can run ~10:1 very safely on aluminum heads and 87 octane. Really, the dynamic compression is going to be the determining factor for pump gas drivability and that is mostly going to depend on the cam. A mild...
  16. Bextreme04

    489ci tow build...

    I would stay away from keith black pistons. By the time you acquire and rebuild any of those heads, you could have just bought better aftermarket ones. If you are going to put factory iron heads on anything, your best bet is to go to a junkyard or find an L29 locally and just get the block/heads...
  17. Bextreme04

    k35 from Fresno, greetings all

    After some research I see that they didn't allow the 205 to pair to a TH400 until '79. Super weird. So if you had a TH350 or SM465 from 71-79 in a 1-ton, you could have the 205, but not if you had the TH400. Seems odd to only allow the strongest transfer case to be behind the weaker trans, but...
  18. Bextreme04

    489ci tow build...

    I am swapping my 350/TH400 for an L29/4L80. I just bought an entire 1997 K2500 Suburban that had the interior and suspension trashed for $500. Engine/trans started up and ran good enough to drive it home. I rebuilt the engine and trans with all new components for ~$3000 including bigger...
  19. Bextreme04

    k35 from Fresno, greetings all

    Odd to see a 203 paired to a TH400 in a 1-ton. Usually that would have been a 205.
  20. Bextreme04

    04 LM7 into 87 K5

    Yes. The issue would be if you are planning on using an electronic speedometer. If you are keeping the mechanical speedo on the output of the transfer case, then you will be fine as-is all the way around. No need for a 4lo switch and everything will just work.
  21. Bextreme04

    04 LM7 into 87 K5

    Pin 71 on the blue connector(C1) can be provided with a momentary ground to trigger Tow/Haul maps and Pin 16 on the green connector(C2) can be provided with a constant ground when in 4lo to trigger the 4lo tables. As stated above, if you are using the sensor off the adapter for VSS and you...
  22. Bextreme04

    04 LM7 into 87 K5

    You can... that's what the 4lo switch is for. You can also set "normal" and "performance" shift points using a tow/haul type momentary button. I have wiring schematics at home that call out what pins those connect to. They actually change the tables that the PCM is using for the shift points and...
  23. Bextreme04

    04 LM7 into 87 K5

    You have to think about what the PCM is seeing compared to what the vehicle is actually doing. If you have the VSS at the transfer case, then the VSS will always show the actual vehicle speed. The engine RPM will be MUCH higher for a given vehicle speed when in 4lo than it is in 4hi, which is...
  24. Bextreme04

    04 LM7 into 87 K5

    If you are picking the VSS signal off before the T-case, then it won't matter if you are in 4-lo or 4-hi. The shift schedule is based on vehicle speed and throttle position, and that won't change if you are in 4-hi or 4-lo based on that signal location. You can still adjust your shift points and...
  25. Bextreme04

    What have you done to your square lately??

    Speedway an Amazon both sell them as well. $1.99 each at speedway...

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