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  1. Matt69olds

    Speedometer Gears

    This will help calculate the gear needed https://www.tciauto.com/speedometer-gear-calculator
  2. Matt69olds

    brake light not working

    Push/pull the hazard switch a couple times, see if that fixes Check for power on the orange wire at the brake switch. If you have power there, push the brake and check for power on the white wire. If that’s good, keep the brake pushed, check for power on the yellow and green terminals of the...
  3. Matt69olds

    Driver side brake light not working

    Check the yellow and green wires at the turn signal switch while pushing the brake. If the voltage is normal, tge problem is after the turn signal switch.
  4. Matt69olds

    New Retrosounds radio won't even turn on? (also what is the grey wire?)

    Gray is dash lamps. If the new radio has a wire labeled illumination or dimmer, that’s the wire you want to trigger the radio to dim the display. This is a pinout for a stock GM radio. Black is ground. Orange is constant power. Yellow is ignition power. Brown is taillight (used on some radios...
  5. Matt69olds

    2wd fuse panel in 4wd

    I’m not all that familiar with the older glass tube style fuse boxes, but for the most part with the exception of fuse boxes for trucks with gauges or idiot lights, they are basically the same. The optional equipment a truck might have had its own separate harness that plugs into the fuse box...
  6. Matt69olds

    Power door locks

    Another option: go to your nearest auto salvage yard. Find a door lock relay from a late 80hp early 2000s GM car or truck. Looks like this: make sure you get the matching harness plug. The wire colors and function match up, the only thing required is to ground the black wire. The original...
  7. Matt69olds

    Ecm mounting solutions

    If it’s a stock ECM, put it under the hood. The factory PCM were under the hood, they are environmentally sealed, and will work just fine. Obviously mount it in a place to limit heat and weather, but compared to how crammed things are under the hood of late model vehicles a square body truck...
  8. Matt69olds

    Engine swap for street and towing

    Don’t bother with the 6L90. It’s hard to beat a 4L80 for comfort, durability, and ease of use. Gear the differential so at 65-70 mph the engine is starting to come onto its torque curve Go with the big block. And since torque is the name of the game here, don’t limit yourself to big block...
  9. Matt69olds

    Turn signal issue/ brake light issue

    Push and pull the hazard switch button several times. That sometimes gets taillights working again. If not, read on. Get a cheap 12 volt test light. Check for power at the yellow wire (left turn) and green wire (right turn) of the turn signal switch at the base of the steering column. If the...
  10. Matt69olds

    Dumb down headlight relays for me.

    Inspect and clean the electrical terminals of the headlight sockets, make sure the grounds are clean and tight. Check the ground that goes from the negative battery post to the radiator support, and from the back of the engine to the firewall. That might make a huge improvement. Get a cheap...
  11. Matt69olds

    Cruise Control

    Rostra makes a very nice aftermarket cruise control setup. You can use the factory cruise lever to control it. On my 81 GMC, I used the factory speed sensor. On my 69 ok, I had to use the Rostra speed sensor that goes inline with the speedo cable. Both systems work very well
  12. Matt69olds

    Timing W/ Manifold vacuum

    If you don’t hear any rattling, add a couple degrees and see how the engine likes it. If you have 20 degrees of CENTRIFUGAL advance, your total mechanical timing is 32. You add the amount of mechanical advance to the initial. Most low compression engines like 34-38ish of mechanical advance...
  13. Matt69olds

    Timing W/ Manifold vacuum

    You either need a timing tape on the balancer, or a dial back timing light. Warm the engine, disconnect the vacuum advance. Note the engine rpm, see what the timing is at that speed, and make a note. Set the idle to 1000, read the timing again, make a note, set the idle to 1500, read the...
  14. Matt69olds

    Timing W/ Manifold vacuum

    Read this: https://www.460ford.com/threads/timing-vacuum-advance-101-good-article-by-gm-engineer.117504/ The vacuum advance needs to compliment the mechanical advance. Get the initial, timing curve, and total timing dialed in with the vacuum advance disconnected. Once that’s all set up...
  15. Matt69olds

    1976 windshield washer pump rebuild kit

    I would agree. Rebuilding the original mechanical pump usually gets it going, but not for long. Like so many things today, the quality of the parts and manufacturing just isn’t the same as 30 years ago.
  16. Matt69olds

    Dexron II or III?

    The crappiest fluid made today is superior to the best fluid 30 years ago. Don’t sweat the kind of fluid. I use the Valvoline Max life synthetic in my vehicles. It’s around 33 bucks a gallon at Autozone. People have said it’s cheaper at Walmart, but I can never find it at my local Walmarts...
  17. Matt69olds

    Truck rewire.

    There are lots of venders that sell ready to install reproduction harnesses. Your other option is to completely remove the harness, lay it out on a large table, and carefully inspect and repair each section and splice. Definitely have a good service manual with a wiring diagram.
  18. Matt69olds

    What do I call it?

    I have seen and heard enough people dealing with DMV and police trying to do the right thing, only to have a huge hassle So, I would prefer to keep the DMV involvement to a minimum, and involve them only if I was absolutely sure everything was absolutely correct with no gray area. It seems...
  19. Matt69olds

    Holley sniper install questions

    I have a Sniper EFI on my Olds, sometimes I really wish I had left it alone with the Q-Jet. I have had more than my fair share of warranty issues, lack of customer support, and one VERY expensive tow bill. If you absolutely have to have EFI, go with the better ECU. There are many parts of sniper...
  20. Matt69olds

    Failed CO emissions-high CO and HC

    Replace the plugs, take the truck for a long hard drive. Make sure the engine is hot and worked a bit. Maybe that will clean up the combustion chambers and exhaust enough for it to pass.
  21. Matt69olds

    350 Running warm

    I bet it you put a thermometer in the radiator fill neck, you will find the coolant temp around 170. I’m betting if you temporarily install a aftermarket gauge with real numbers, the engine will ge around 190. By the time the coolant goes thru the radiator to the filler neck, it will have cooled...
  22. Matt69olds

    Cracked block

    Somewhere out there is a 327 in a mid 80s Firebird with epoxy in the intake valley. A friend built the engine, lots of fancy new parts and machine work, but didn’t bother with magnaflux. Couldn’t figure out why the oil always looked like chocolate milk. I don’t recall how he found the crack...
  23. Matt69olds

    Ran out of gas, but tank not empty

    What fuel pump did they send that had 85 psi?! TBI needs something like 15-20 psi, to the best of my knowledge TBI is the only fuel injection available on a square. Sounds somebody boxed the pump wrong, or gave you a pump for the wrong application
  24. Matt69olds

    Taillight always on

    The hazard lights circuit is powered at all times, they are on the purple wire in the turn signal connector. It’s sounds as if that particular taillight is somehow getting power from the hazard circuit. Disconnecting the turn signal connector isolates the taillights from that power source...
  25. Matt69olds

    Tv cable stud size

    First thing first, what carb and throttle bracket do you have? The TV cable mount hole is not the same as what’s used for a 350 kickdown cable. To many people think as long as the cable is tight at WOT, it’s good to go. That’s not the case. The cable needs to move in the correct arc, and pull...

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