Search results

  1. Matt69olds

    Keep Manual shift for the LS or swap in an auto?

    I personally have never messed with a 6L80, but the stamped steel carriers and clutch housing tells me all I need to know about them. Compare the flimsy stamped steel stuff to the machined steel carriers of the 400/4L80. It’s a night and day difference.
  2. Matt69olds

    Keep Manual shift for the LS or swap in an auto?

    The 4L80 will handle far more abuse than a 6L80/6L90, with half the expense. Assuming your junkyard 4L80 is in good condition, a shift kit that dual feeds the direct clutch will make a 4L80 reliable to 700plus hp, with room to grow.
  3. Matt69olds

    4l80e with no controller

    https://atracom.blob.core.windows.net/gears/2015/2015-03/2015_3_32.pdf Jakes performance in Texas sell a plug in manual valve body conversion box, it does t even require dropping the oil pan to install it. It requires an ignition power source, and a ground wire to trigger the converter clutch...
  4. Matt69olds

    Hard Start when engine is warm.

    Bingo! Lots of people don’t understand the difference between 2 and 3 line pumps and the way they function. They cap off the 3 line and then wonder why they have this exact concern.
  5. Matt69olds

    rusted drum

    Once you get the rust cleaned off, feel the machined surface where the sealing rings ride. If there are any pits or scratches that you can feel with a fingernail, the drum isn’t worth using. As nick said, if it’s on the outside of the drum, or not a machined surface, more than likely it’s...
  6. Matt69olds

    Running cold and rich. Idle mixture screws all the way in!

    Look down the throttle bore while it’s running, so you see fuel dribbling out the venturi? If so, you might have the float set too high, or the clip that hold the needle to the float hanger wrong. Some people think the clip goes thru the holes on the float, it actually just hangs over the float...
  7. Matt69olds

    Replaced stock radio with an amplifier and now turning on headlights turns it off

    Look at the wires a little closer, I’m betting what you thought was a black ground wire is actually a brown wire for the taillight feed to the radio.
  8. Matt69olds

    Wire Connector Help

    Delphi terminals go from series 150 (the smallest) to 630. The have one size larger for Maxi Fises, but I can’t find an illustration. The bigger the wire gauge, the bigger the terminal needs to be. https://theelectricaldepot.com/weather-pack-delphi-connectors
  9. Matt69olds

    Carb question

    Of course it started, it’s a Q-Jet. Nothing unusual about it running well. The most common carb ever built, used on who knows how many millions of GM cars and every 4bbl squarebody.
  10. Matt69olds

    Key wiring diagram for 78 chevy 1 ton van

    I’m at work, it’s entirely too loud to hear your video. I assume you’re trying to figure out the crank circuit? The crank trigger comes out of the ignition switch as either a purple wire with yellow tracer, or a solid yellow wire. It then goes to the nuetral safety/clutch safety switch, and...
  11. Matt69olds

    Wire Connector Help

    That’s either a 480 or 630 series terminal. If you need one in a hurry any GM dealer will more than likely have one.
  12. Matt69olds

    87 brake lights

    Before doing anything, push/pull the hazard light button a few times, see if that get all the lights working. Find the brake light switch at the brake pedal. Use a 12 volt test light, make sure you have power on the orange wire. If not, double check the stop lamp fuse. If you have power...
  13. Matt69olds

    Fuse box from 80ish up square?

    Sounds good! Thanks.
  14. Matt69olds

    455 Olds Dual Quad Tunnel Ram

    Looks good!!
  15. Matt69olds

    4.1 mpg?

    How are you calculating distance driven? Fill up the gas tank, drive a known distance. Use the mile markers on the highway if needed. Stop and refill. Divide the miles driven by the number of gallons needed to refill the tank. Unless it’s way out of tune, or leaking fuel somewhere, I find...
  16. Matt69olds

    TH400 (2WD): New tail shaft bushings are too tight. Why??

    Assuming you can get the yoke to go is, smack the yoke with a rubber mallet. Hit it from the 12:00, 3,6, and the 9 o’clock position. Might have to do it a few times. If that doesn’t work, you might have to hone the bushing to get a good fit. A wheel cylinder hone is ideal for this job. Go...
  17. Matt69olds

    455 Olds Dual Quad Tunnel Ram

    You will need one of these to go with the tunnel ram!! https://shop.davidfreiburger.com/products/the-official-tunnel-ram-tee Occasionally, the tunnel rams show up for sale. If I see one I’ll be sure to let you know.
  18. Matt69olds

    Air in fuel system

    Remove the gas cap and drive it. If it drive’s normally, there is something screwed up with the vent.
  19. Matt69olds

    Fuse box from 80ish up square?

    Drop whatever trivial thing you are doing and deal with my concerns IMMEDIATELY!! Ok, whenever you get a chance check it out and get back with me. Thanks!
  20. Matt69olds

    Fuse box from 80ish up square?

    Anyone in readerland with a seriously hacked up wiring harness? I’m looking to install a ATO style fuse box in my sons 71 El Camino. This will be a Frankenstein project, but nothing we didn’t anticipate. I built my own dash harness years ago for my 69 Olds. I used a fuse box and bulkhead...
  21. Matt69olds

    Torque Converter Recommendation

    The 3-4 clutch has been a problem since day one with the 700. The 1st family of 700 used only 5 clutches, combined with the really sloppy clutch clearance GM recommended and the puny orifice in the spacer plate just makes it worse. HydraMatic made some improvements with the later 700 with...
  22. Matt69olds

    Fuel System Advice

    I’d be more concerned about the flow rate of the switching valve. I don’t see this going well. Are you putting a pump on each tanks? Most electric pumps don’t like to pull fuel, add the restrictions of the switch valve I bet it’s worse. I’d be really surprised if a 3/8 line will be enough for...
  23. Matt69olds

    No spark need help

    Read this: https://www.gmcmi.com/wp-content/uploads/2014/05/HEI-Testing.pdf Make SURE you have full battery power on whatever wire you have plugged into the BATT wire in n the distributor cap. If so, move on to the next step. If not, find out why. If you have power to the BATT wire, plug it...
  24. Matt69olds

    How do YOU set timing?

    You don’t HAVE to own the fancy timing light. If you know the balancer diameter and some simple math you can easily calculate where to put the new mark
  25. Matt69olds

    How do YOU set timing?

    https://www.460ford.com/threads/timing-vacuum-advance-101-good-article-by-gm-engineer.117504/ Even though this is info from a Ford forum, it’s good info.

Latest posts

Forum statistics

Threads
44,162
Posts
950,637
Members
36,273
Latest member
dannyphx
Top