Recent content by Matt69olds

  1. Matt69olds

    High oil pressure after replacing pump

    I personally wouldn’t worry about the pressure until it gets entirely too low, or starts blowing off oil filters. There are lots of engines that will run forever with no pressure ( some seem to run without oil!) and some that normally run much higher pressure. I’d maybe consider dropping back...
  2. Matt69olds

    backfire under wide open throttle

    Put a test light on the tach terminal, ignition on. Does the light glow? If so, the distributor has power, and the primary side of the coil is good. Crank the engine, the light should flicker. If not, carefully inspect the wires to the pickup coil. If they are good I’d suspect the ignition...
  3. Matt69olds

    Alt putting out 17.4 volts. NOT GOOD right?

    If your reading 14.2 at the battery, but 17 at the alternator, then you are losing 3 volts in the charge wire. Either it’s severely undersized, or it’s in bad shape. Fix that and I bet the problem is solved.
  4. Matt69olds

    80' fuse box diagram,,,,,

    Before doing anything, push and pull the hazard switch a few times. Sometimes that cleans the contacts and gets troublesome lights working again. Check the brake light switch. See if you have power on the orange wire, then press the brake pedal, you should then have power on the white wire. If...
  5. Matt69olds

    Custom drive shaft.

    I just had a driveshaft built for my son’s 92 Yukon. Same thing, we just installed a 4 inch lift. Even though there was no mention of driveshaft modifications in the instructions, common sense made it obvious that about 25% of it’s normal engagement wasn’t going to cut it!! The shop that built...
  6. Matt69olds

    Do I restore my AC or?

    Is the system completely empty? If it still has a partial charge, you can rest assured the system doesn’t have a major component failure. Replace all the orings with 134a compatible seals. Replace the dryer. Replace anything else that’s questionable, especially the condenser. Drain the old A/C...
  7. Matt69olds

    Battery cable recommendations.

    Be careful using welding cable. While it will definitely tolerate the current, the insulation isn’t as forgiving with oil. Find a heavy equipment or heavy truck repair shop. They will have actual battery cable that’s suitable for automotive use, and in the gauge you need. The truck shop near...
  8. Matt69olds

    TH350 oil level, engine off

    Here is a hydraulic schematic from a service manual. As you can see, line pressure comes out of the pump, and tee into the pressure test port. It then continues to the manual valve. The test port is dead headed at the pipe plug. Adding potential issues, I remember someone here trying to use...
  9. Matt69olds

    TH350 oil level, engine off

    Installing a temp gauge in the case is useless, there is no fluid flow. All you will read is the temperature of the transmission case. Put the sending unit in the pan.
  10. Matt69olds

    Modified engine crewcab gas mileage?

    Not too many people understand lean mixtures at cruise is no big deal. Everyone freaks out thinking they are going to melts pistons or the engine will run hot. Nonsense!! At cruise, the engine is under a light load. It’s not going to run hot. Find a smooth level road to test. On a typical...
  11. Matt69olds

    I’m pretty pissed!!

    You are absolutely correct, I did bring some of it on myself. I made several mistakes. Mistake number 1: reading the instructions (which were VERY generic, meaning not application specific) the general instructions say to use a torch to slightly heat the rubber, then push the old bushing out...
  12. Matt69olds

    Modified engine crewcab gas mileage?

    Or central Indiana! Or Michigan, Ohio, or anyplace my recent travels have taken me.
  13. Matt69olds

    What would you pay for this truck?

    You have my attention. That’s a decent truck around here, and 2k would be in the ballpark of what something in that condition would go for. So now I’m curious: what would a clean Arizona beater truck go for? I’m talking about typical sun scorched paint and interior, well worn but functional...
  14. Matt69olds

    Unknown Relay clicking

    The black box is the horn relay. If it’s clicking with no horn, either there is another fuse blown, defective or unplugged horns, or a defective relay. What are the odds the truck has an aftermarket steering wheel? I bet you find the reason the relay clicks is in the steering column, more...
  15. Matt69olds

    Why did GM do this???

    I figured it was bolt stretch, or maybe there was a transmission/transfer case option the WOULD have needed the spacers for acceptable driveline angles. I figured there had to be a reason. I work in a Big 3 factory, there are lots of people who’s entire job is figuring out ways to either put...
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