Recent content by Matt69olds

  1. Matt69olds

    Not using factory fuse box after engine swap, lighting wiring with column and ignition switch problems.

    The nice thing about GM is they have used the same basic wire colors for certain functions since the 50s. This is a screenshot of a factory wiring diagram for a 72 Olds. I’m 99.9 percent sure these colors will match your trucks turn signal switch.
  2. Matt69olds

    TH350 dipstick tube and dipstick for a TH400???

    If you can’t find a aftermarket part that checks off all your boxes, make your own!! It sounds like you already have a good tube with the desired boot style seal for the case. Now you need a dipstick that locks and will give you an accurate reading. Drop the transmission pan. Install your...
  3. Matt69olds

    Not using factory fuse box after engine swap, lighting wiring with column and ignition switch problems.

    Power comes into the truck on 2-3 heavy gauge red wires. One goes to the headlight switch and other items that are powered at all times, the other goes to the ignition switch. The ignition switch splits the power up by function. I don’t have any manuals handy, but I do remember an orange, brown...
  4. Matt69olds

    Converting Diesel Wiring to Gas

    It’s been years since I converted mine. If I remember correctly, the wiring for the diesel engine ran thru a firewall connector very close to the drivers side valve cover. The heavy gauge pink wire in went to the fuel cutoff solenoid, I used that to power the HEI. I unplugged the firewall...
  5. Matt69olds

    What is this wire?

    Find the nuetral safety switch at the base of the column. Look for the connector with a yellow and purple wire. Yellow is crank trigger from the ignition switch, purple is the starter crank feed. Make absolutely SURE the transmission is in park, jumper the purple wire to battery power. If the...
  6. Matt69olds

    What is this wire?

    Try starting it in neutral. If that doesn’t work, make sure your foot is firmly on the brake, hold the key in the crank position, and slowly move the shifter thru the gears. If it cranks, the switch isn’t adjusted correctly.
  7. Matt69olds

    Power window/lock/mirror Frankenstein conversion??

    I made harnesses for the power windows and door locks. All of that works as expected and very well. Of course, once the truck was finished my son decided he wanted keyless entry. why couldn’t he have thought of that will we were building the harnesses?? I have tried a different mirror switch...
  8. Matt69olds

    Throwing Parts at the Wall

    The fast idle start is designed into the calibration. GM programmed the PROM that way to ensure the O2 sensor and catalytic converter heats up as quickly as possible. I’d start with cleaning the IAC bore and pintle. I remember seeing an extra pair of wires (besides the common purple and green...
  9. Matt69olds

    I burnt it up didn't I? Take a look HEI got wet.

    Read this: https://www.gmcmi.com/wp-content/uploads/2014/05/HEI-Testing.pdf
  10. Matt69olds

    TH400 Information Thread

    I have been searching for the unique 1-2 modulator valvetrain setup for my car to duplicate the automatic 3-1 downshift. As many high performance transmission builders there are, I have no doubt a bunch get thrown away when machining stock valve bodies for transbrake and reverse manuals. I’d be...
  11. Matt69olds

    Electric Fan Runs After Shutting Off Engine: Where To Start

    Stuck relay? Smack the relay with a screwdriver, see if it stops. If do, replace the relay.
  12. Matt69olds

    TH400 Information Thread

    The OW and BB calibration (I wouldn’t be surprised to find Pontiac and Chevy had their own codes for basically the same transmission) used a unique valve body, a 6 clutch direct drum with no wave plate, and probably a specific govenor. Some of this is outlined in the factory service manual, some...
  13. Matt69olds

    Need help settling a debate

    Check the wires on the pickup coil. The constant back and forth movement of the vacuum advance will bend the tiny wires and cause intermittent no spark. The engine will continue to run, just load up cylinder’s with fuel. When spark is returned the fuel ignites with a bang.
  14. Matt69olds

    how fast is your power window?

    I did the relay and express down modification on my 81 a few years ago. The windows are pretty fast now. Not new car fast, but definitely better than they were stock.
  15. Matt69olds

    Headlight Dimmer Switch

    Have you tried to adjust the switch? It sounds like the plunger isn’t being pushed into the switch far enough to cycle.
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