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  1. K

    Anyone have a LS swapped 3+3?

    From what I’m seeing, it’s insanely expensive to tune and add functions to. Spear tech mods the harness and can tune the ECM/TCM for only $3,950 plus S&H. The L8T/6L90 are $10k engine, trans, harness and ECM/TCM. It’s still not bad considering the drivetrains have under 20 miles and a GM Connect...
  2. K

    Anyone have a LS swapped 3+3?

    Yeah I watch it all the time. His is 5.3 but I’m not sure how the power of it moves a 7500 pound truck since min is drw and I’m converting to 4x4. I’d also like to tow. On a side note I’ve watched lots of YouTubers (including VGG) report many failures of Holley Sniper and EFI systems. That’s...
  3. K

    Anyone have a LS swapped 3+3?

    Looking for insight on LS swapped heavy trucks. I intend to use my 3+3 C30 Dually as a cruiser and going out of town mostly, with some occasional towing like a 6x10 enclosed trailer with my motorcycles. I also would like to be able to pull heavy trailers, shorter distances as I work on RVs for a...
  4. K

    eBay drop out L8T mated to 6L90E thoughts and/or drivetrain suggestions.

    Thank you for the info. There are lots of L8T Silverado/sierra. The tuning I was figuring on paying to unlock the exam $700 but if I can do it with an E38 would be great.
  5. K

    eBay drop out L8T mated to 6L90E thoughts and/or drivetrain suggestions.

    Install seems pretty straightforward, I found a bracket kit for engine, trans and power steering mounts. From what I see it’s a bit close to the master cylinder but not an issue for me since I’ll retain the hydro boost. I’d love to keep the 454 but I want fuel injection, I’m not interested in...
  6. K

    eBay drop out L8T mated to 6L90E thoughts and/or drivetrain suggestions.

    Yeah it’s a decent deal. 6.0 was my initial thought but it’s not much cheaper than the LT and it’s down almost 100tq to the L8T. I’m still considering the 6.0 since LS swap stuff is cheaper, readily available and all the bugs are worked out. I considered the 6.2 but since I will be towing I’m...
  7. K

    eBay drop out L8T mated to 6L90E thoughts and/or drivetrain suggestions.

    $10k is a lot l but GM connect and drive LT1/8l90 is twice that with a 2yr/50k warranty. And it doesn’t include accessories like brackets for alt/power steering/water pump/fan/etc. Factor in that a rebuild locally with cam and domed pistons to bump compression is $4k and 6 months waiting and...
  8. K

    eBay drop out L8T mated to 6L90E thoughts and/or drivetrain suggestions.

    It is the 6.6L gas engine based on the new LT platform, replacing the L96 6.0 in HD trucks. Around 400hp and 450tq, mated to the 6l90E 6 speed auto.
  9. K

    eBay drop out L8T mated to 6L90E thoughts and/or drivetrain suggestions.

    Hello, Anyone have any experience with these drop out drivetrains? $10k for an engine/trans/ecu/harness seems pretty reasonable considering most have under 50mi on them and lots with single digit odometer numbers. I have 1985 3+3 dually 2wd Silverado I’m building no rust on the cab anywhere...
  10. K

    454 SM465 4.10 vs 3.73 vs 3.54

    @Square root I have stayed up a few nights chasing this rabbit and the “best” gear spread was th400 and GV but with tq slip and anticipated highway driving the revs are still a bit high for the cost. While highway driving/towing the revs with 4l80 and 4.10 look pretty good and seems the best...
  11. K

    454 SM465 4.10 vs 3.73 vs 3.54

    I play with tire sizes and the sm465 gears are too far apart if I do any towing. The nv4500 is too expensive since I have not been able to find one used. Been doing the calculations and even with gear vendors the spread is too far apart if I’m towing. Th400 and gear vendors are well spaced very...
  12. K

    Transmission is causing engine to stall

    So update, I replaced the distributor with a known good one, and no difference. I got starting fluid and sprayed everywhere there is vacuum. I found a vacuum leak at the carburetor gasket. Replaced gasket. It runs better but still not perfect. My timing light took a dump and my compression gauge...
  13. K

    Holy Grail of Squarebodys

    Thank you. When my grandpa passed they let his truck go to the scrapyard (77 hi boy 4x4) it wasn’t great but it was his. I was a kid when a tow truck picked it up, I wish I’d said something. I did sell a few cars of my dads that were not worth restoring or too far gone for me to deal with. But...
  14. K

    Transmission is causing engine to stall

    You know I was thinking about this. I did the tune up on it to get it running and change the oil. The distributor is 100 degrees or so from where it should be and I need to pull it to set back so I’ll look at it. This was strange to me as well, as I have never had this happen. I did some...
  15. K

    Transmission is causing engine to stall

    What else would cause and why in coward but not reverse? I don’t think so but that’s what it seems like, but only does it in D, 2 or 1 , not in reverse.
  16. K

    Ignition lock cylinder won’t come out

    I had this issue with my 78, there was a piece of cast aluminum that needed to be removed. Behind the pirate was the release tab its paper thin but it looked solid since it blends in with the rest of the casting. Mine did not have a retaining screw.
  17. K

    Holy Grail of Squarebodys

    Mine would be a 1978 C10 Scottsdale 350/th350. Purchased new by my father and mother in late 77 at Galles Chevrolet. I have all the paper work including the original sales contract with my grandfather as co-signer. My dad passed in 2021 and I bought it from his estate. All original, paint fade...
  18. K

    Transmission is causing engine to stall

    I bought this truck a few weeks ago and just started working on it. 1985 C30 3+3 dually 454 th400. I got it started after replacing a bent fuel pump push rod and fuel pump. I got it up to temp to check for leaks. All fluids were checked and ok prior to starting. I got warmed and checked for...
  19. K

    What did you pay for a square

    No rust in floors, kick panels, rockers, doors or corners. 1985 C30 3+3 .454 400Auto, A/C, power windows and locks, cruise and tilt. I paid $2500. Camper special.
  20. K

    454 SM465 4.10 vs 3.73 vs 3.54

    I see so the torque multiplication comes from the difference in speed between the crankshaft and input shaft and as the speed equalizes the multiplication comes down to zero, thanks for the info. As for the K30 I’ll be running 235/85 R16 (on steel wheels so I can rotate them) so they...
  21. K

    454 SM465 4.10 vs 3.73 vs 3.54

    I think there is some torque multiplying factor in the torque converter, if I’m not mistaken I’m not familiar enough with autos to do the math but I remember something along those lines. Like I said I could be mistaken.
  22. K

    454 SM465 4.10 vs 3.73 vs 3.54

    My truck is geared real low. If I keep 60-65 it’ll get 14-16, I drive 75 or so. I don’t mind the fuel I factor it in the job when I’m working and it pretty much only moves for money. That load was around 16k I pulled it just fine at 65 mph (speed limit to where I was going). Thats why I want to...
  23. K

    454 SM465 4.10 vs 3.73 vs 3.54

    This is why fuel economy doesn’t bother me. My 7.3 gets 10.3 unloaded or 9.8 loaded over. @ $4.50 a gallon my K30 gets the same fuel economy while burning $3.19 per gallon fuel. And I get to cruise around my dads old truck. I’m only concerned with longevity mostly and “comfort” to some degree.
  24. K

    454 SM465 4.10 vs 3.73 vs 3.54

    That was my initial consideration, since I’m pretty much building the truck frame off and want use it often. I am going to replace all bearings and reseal both axles at which point the labor would be an extra hundred dollars plus the cost for gears. Since that will get done no matter what I...
  25. K

    454 SM465 4.10 vs 3.73 vs 3.54

    That’s a nice setup but too many variables for me, having no experience with this swap, I’d rather do the GV since there is less chance of me buying all the wrong parts, I appreciate all of your information

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