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  1. Bextreme04

    74 k10 going 55 mph is at 3,500 rpm

    Its likely to be a truck 12 bolt axle. I can't imagine it came stock wit ha 4.56, but if someone had big tires on it at some point they might have swapped them in. Going that big would have called for a carrier change, so they might have put a limited slip or locker in there at the same time...
  2. Bextreme04

    Blower fan/relay

    Unplug the wire to the blower motor. Use a mutimeter or a dummy light and with the ignition switch on, see if you have power at the blower motor. If yes, replace the blower motor. If no, move over to the relay. If you are getting power going into the relay, but not out then it is a bad relay. If...
  3. Bextreme04

    74 k10 going 55 mph is at 3,500 rpm

    If you pull the diff cover, you can see what ratio you have. If you haven't done that already, I would highly recommend it to at least make sure you have clean gear oil in there. You will see two numbers stamped into the side of the ring gear. Usually something like 41 10. That is the number of...
  4. Bextreme04

    74 k10 going 55 mph is at 3,500 rpm

    So... just looking at a basic calculator here. What size tire do you have? According to this calculator: https://spicerparts.com/calculators/engine-rpm-calculator with a 31" tire and 3.73 gears, you would be at 2283RPM. With a 28" tire and 4.56 gears, you would be at 3090RPM. Which is right...
  5. Bextreme04

    74 k10 going 55 mph is at 3,500 rpm

    How do you know what your RPM is? Factory tach? Aftermarket one? Where are you at in Oregon?
  6. Bextreme04

    K10 Misfiring

    When was the last time you did a tuneup? Worn cap/rotor/wires and worn or dirty plugs could all cause that. Make sure plug wires aren't shorting out on the manifolds too.
  7. Bextreme04

    Replace leaf springs or not?

    Only if someone has severely overloaded them and/or done some funky stuff with them to create a sharp stress point. If they are broken, replace them. If not, just refresh them and put new bushings in. I took mine apart, put in new leaf slider pieces, painted the underside with EZ-slide graphite...
  8. Bextreme04

    Who's truck is this????

    You don't need any floor change to clear a 4L80 on any squarebody. The high hump is to clear the transfer case, not the transmission.
  9. Bextreme04

    5/8” ID oil rated hose recommendations

    Customer service for most companies is really hit or miss lately. The Aeroquip stuff specifically is mil-spec rated and qualified and is used extensively in military, commercial, and general aviation. If you want something that is absolutely going to hold up to what it says it will and then...
  10. Bextreme04

    6.7 Cummins Suburban Build

    Dana 60 was every year squarebody K30. There is a difference between a dually Dana 60 and Non-dually... so keep that in mind too. You can also get passenger drop Dana 60's from some year dodges. https://www.pirate4x4.com/threads/front-dana-60-axle-tech-page-1.2702793/#post-44988366
  11. Bextreme04

    6.7 Cummins Suburban Build

    just find a junker heavy K20 that someone is selling for cheap. Either the 8600GVW from 73-80 or a C6P optioned one from 81-up will have the heavy 13" rear drum 14BFF and a heavy hub Dana 44 or 10 bolt front. Up here in Oregon you can find a whole set of axles from one for about $300. A Dana 60...
  12. Bextreme04

    What have you done to your square lately??

    Remflex FTW. You'll never have another blowout with these. If this pattern doesn't match your head/header combo, they have one that does. https://www.summitracing.com/parts/rfl-2021?rrec=true
  13. Bextreme04

    5/8” ID oil rated hose recommendations

    Also, pay attention to the rated operating temp. Power steering, especially in a hydroboost system can get VERY hot. Similar to engine oil cooling systems, I prefer the higher rated aeroquip or similar hoses that are designed for working temps up to 300 deg. F. Some of the cheaper summit and...
  14. Bextreme04

    5/8” ID oil rated hose recommendations

    Can't go wrong with Aeroquip. AN-10 is equivalent to 5/8". https://www.summitracing.com/parts/aer-fcn1020?seid=srese1&gclid=CjwKCAiA98WrBhAYEiwA2WvhOsDg50wMJljJAB94NvsgaIEI7t1snmd8WUk6wK98Dp9kaPt3KrW0NxoC4scQAvD_BwE
  15. Bextreme04

    heads are at the machine shop, Gasket question and my new cam

    I'm currently rebuilding an L9H(6.2L Gen IV) and I just used new GM MLS head gaskets and GM front/rear and oil pan gaskets. The stock GM ones are at 240k miles on my 2011 Suburban 5.3L and have zero leaks, so why try to improve on that with an unknown. I AM using fel-pro intake manifold gaskets...
  16. Bextreme04

    Engine mount replacement?

    The old motor mounts weren't bad, but I was putting in a rebuilt engine so I put new engine mounts in. No real noticeable difference and no new vibrations appearing in the several years since. I was missing a bolt and mount from the T-case mounts, and the ones that were still there were squishy...
  17. Bextreme04

    Engine mount replacement?

    Also, just wanted to add that while the 2292's are standard for all SBC engines, the transmission mount will be specific to the year range, transmission type, and whether it is 4wd or 2wd. For instance, a 2wd TH400 will use a different mount than a 4wd TH400, and a 73-84 4wd will use a different...
  18. Bextreme04

    Engine mount replacement?

    The 2292's are the standard SBC motor mount. I have a set of Pioneer or Anchor ones on mine for about 3 years now and they are still going strong. Generally they will last forever as long as they don't get constantly sprayed with too much oil. It's a stupid easy thing to change, so in my opinion...
  19. Bextreme04

    Pulling all the smog stuff

    I'm not putting the cats in until I convert to EFI. I need upstream for fuel trims and both upstream and downstream to monitor and optimize cat function and longevity. There's one additional bung in there for the wideband, but it is only there during the initial tuning of WOT. Running rich will...
  20. Bextreme04

    Pulling all the smog stuff

    That's my plan as well. I'm running long tubes, so basically I Have gone about 1" back from the merge and installed the upstream O2 sensor bung, then cut off the garbage three hole flange and welded on a V-band clamp. Then welded the other side of the v-band clamp to the converter and then the...
  21. Bextreme04

    Pulling all the smog stuff

    I'm just going to mention this on here, make sure that you get the right CAT for your truck. Most modern or high flow cats are going to be a honeycomb design and will not function properly in the stock location on a carbureted truck. You will need to either relocate them(still not ideal), or you...
  22. Bextreme04

    Oil Primer tool. Make your own, the easy way from your own scrap.

    This is also the ONLY way to prime an LS motor besides just killing the fuel pump feed and cranking until you get oil pressure.
  23. Bextreme04

    Oil Primer tool. Make your own, the easy way from your own scrap.

    Depends. It's a 5 minute detour on my way home from work for me and I don't have enough bad distributors laying around to spend 30 minutes cutting one apart. At this point, I have so many different projects and so little spare space for extra parts that it is way easier and cheaper for me to...
  24. Bextreme04

    Oil Primer tool. Make your own, the easy way from your own scrap.

    Or just rent the one from Autozone for free. If you decide to not return it... it's a whopping $9
  25. Bextreme04

    Anyone use edelbrock universal EFI fuel sump Kit w 2 tanks

    Heres a quick screen grab of the instructions PDF from the EFI sump kit with some crude arrows to show what I'm talking about. I would use a rough ~100 micron filter between the mechanical pump and sump and then the one that Edelbrock includes in the kit between the sump and the fuel rail. The...

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