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  1. Matt69olds

    Stock 350 getting hot, but only on the highway with AC on

    Unless it gets hotter, 210 is no big deal. Make sure all the shrouds and baffles are in place. Make sure the shroud fits snug to the radiator. Make sure any air that enters the grill has to pass thru the radiator on the way out. Make sure there is nothing trapped between the condenser and the...
  2. Matt69olds

    Jumpy oil pressure gauge

    If the wiring is intact, most likely it’s the sending unit.
  3. Matt69olds

    Automatic transmission newbie asking basic questions

    This is the correct way to set a TV cable. You will need a helper. Remove the air cleaner. Have a helper floor the gas pedal while you look down the throttle body. Make the the throttle opens completely. Sometimes the floor mat holds the throttle from opening, linkage flex, whatever. Bend the...
  4. Matt69olds

    New to me truck/ what should i go through and look at

    Look the truck over throughly, especially the suspension, brakes and electrical components. Check the belts and hoses. Keep an eye on the fluids for the first few weeks. Let the inspection and driving tell you what to fix first. Replace anything that is worn or damaged. Personally, I wouldn’t...
  5. Matt69olds

    How to increase your odds for success at automotive wiring, electrical installation and trouble shooting.

    The best advice I can offer is to buy a FACTORY service manual for any GM car from about model year 85 to the early 90s. Things like charging systems, power windows, door locks change very little from the early 70s to the mid 90s. The nice thing with GM is they tend to keep the same wire...
  6. Matt69olds

    Towing with a 305 V8?

    Inattentive drivers, and the weezing underpowered engines of the day is the reason why they say not to tow in overdrive. As long as nothing slips in the trans, probably 80% of the heat created in the transmission comes from the torque converter. The transmission really doesnt care what gear it’s...
  7. Matt69olds

    Towing with a 305 V8?

    Where is the choke pull off? Just my opinion, keep the Q- Jet. You will never equal the fuel economy or drivability of a well tuned Q-Jet with a Holley or edelbrock. Get the factory carb right, even if that means sending it to a specialist. If you’re serious about towing with that truck, put...
  8. Matt69olds

    TH350 dipstick tube and dipstick for a TH400???

    I’m pretty sure the tube won’t interchange, otherwise why would they have different part numbers? The dipstick might work if it’s the correct length. The full mark on the dipstick should be at the parting line between the case and oil pan.
  9. Matt69olds

    Have to start in neutral or hold the shifter.

    Check all the bushings in the linkage. There is a plastic bushing and spring in the pivot that goes from the transmission to frame. There is also a plastic bushing on the steering column pivot. Any slop in those will make adjustment of the NSS a hassle. You use to be able to find the bushings...
  10. Matt69olds

    Cruise Control wire

    Crap, I forgot about the sleeve! The sleeve slides out the bottom of the column.
  11. Matt69olds

    Cruise Control wire

    That’s exactly why the hole is there. This is one of the few times the engineers designed something with serviceability in mind.
  12. Matt69olds

    Cruise Control wire

    Don’t try to remove the connector!! Put the tilt steering column in the straight position. Get some thin solid wire, tie the wire thru that little hole in the connector. Pull the old switch wire up thru the column, tie the new switch cable to the picture wire. Pull it back down the column. Work...
  13. Matt69olds

    Identify this please

    Or the dash bulb that provides the light is burned out. The light in the ashtray is very dim, just barely enough to see
  14. Matt69olds

    Alt Light addition

    Pretty sure this is the tool kit I bought. JRready ST5211 Pin Removal Tool KIT for Weather Pack Metri Pack Series Connector Harness terminals and Connector Crimp pin etc Electrical Connector, Tool KIT Include DRK 785084 Amp 1.5mm Removal Tool https://a.co/d/6eanl3x I think every square body...
  15. Matt69olds

    Where to mount TH700 manual lock-up switch?

    A lockup converter locks the turbine of the converter to the cover inside the converter, eliminating any slip. A conventional converter will have 200-300 rpm of slip at cruising speed. You could use the cruise on/off switch, the solenoid draws very little current.
  16. Matt69olds

    Where to mount TH700 manual lock-up switch?

    You can probably get away with it, as long as you have a good transmission cooler. Most of the heat in a transmission comes from the converter. It’s pretty easy to make the lockup functional. It helps fuel economy, and make the car a little more comfortable on the highway.
  17. Matt69olds

    Alt Light addition

    The alternator light is powered by the gauges fuse in the factory fuse box. I know all too well the hassles of custom wiring. When I first started playing around with cars, I use to run wiring without any thought of how I would service things later. The ability to remove and disconnect...
  18. Matt69olds

    Where to mount TH700 manual lock-up switch?

    On cars/trucks with column mounted headlight dimmer switches I have used a floor mounted dimmer switch. One project car we used one of the cheap push buttons included in line locks that are designed to slip over transmission shifters. He put it on the column shifter lever and wired it thru a...
  19. Matt69olds

    Alt Light addition

    This is an option. https://www.summitracing.com/parts/aww-510287 Basically, the way the warning light works on a GM car is: Power is supplied to one side of the warning light from the pink/black tracer wire powered from the Gauges fuse. The other side of the light is connected to the brown...
  20. Matt69olds

    Interior Bulb ID

    Pretty sure there is a bulb chart in the owners manual. Most dash lights are 194. Warning lights or turn signal lights are sometimes 168, same bulb design but slightly higher wattage and just a bit brighter. I’m guessing GM did that help get your attention if the bulb comes on.
  21. Matt69olds

    Ignition switch wiring help

    Just from memory, I don’t have a book handy. Red is battery. Brown is powered in “run” and accessory, it won’t have power in crank. Purple (might have a yellow tracer) is crank, it goes to the neutral safety switch and comes out solid purple. Orang is also ignition, it powers the heater, power...
  22. Matt69olds

    Th400 magnet? Are they supposed to have one?

    If it doesn’t have one, put one in. It seems most original 350/400 cores I have taken apart don’t have magnets. GM probably saved a penny or 2 by not installing magnets. I put one in every trans I build. It’s cheap insurance and cheap diagnostic aid.
  23. Matt69olds

    mods for LONG LIFE (ie a rustfree chassis for decades??)

    I know this thread is almost 10 years old, but I’ll share my thoughts. Without a doubt, live in a dry climate!! I have taken apart Arizona cars and decided right then my next project car will be a dry climate project. Break a bolt loose, unscrew it with your fingers. No need to PB Blaster...
  24. Matt69olds

    Oil pressure help

    If you still have the old filter, use some tin snips to cut it open. Look for debris in the filter media, if it’s clean then you can be reasonably sure the engine isn’t eating itself. I would suggest putting another gauge on it, just to verify the problem is real. Regardless of the numbers...
  25. Matt69olds

    Here's one for the Holley/Eddy debate...

    I have seen video of the race from the 60-70s, and Roadkill garage took an old junkyard Chevelle (I think) to the top. I noticed it was paved. The difference was pretty dramatic

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