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  1. Matt69olds

    Unusual radio issue

    This is EXACTLY the cause. It turns out the yellow IGN wire is just a “wake up” signal to the radio. It takes a minimal amount of voltage to power up the radio, and a minimal amount of power to keep it on. It turns out the stray voltage was a result of another modification I had made to his...
  2. Matt69olds

    Is this a TH350 & which flex plate???

    Yes.
  3. Matt69olds

    How do I test mechanical fuel pump

    The 3rd hose fitting is a return. It’s designed with a tiny orifice to provide a controlled leak back to the tank. Its purpose is to constant circulate fuel to keep the pump cool, and to vent excessive pressure back to the tank after shutting off the engine in hot weather.
  4. Matt69olds

    Keeping heat out of Th400

    Since you are going to have both transmissions apart, definitely do the dual feed modifications and roller bearing at the back of the case. Drill the spacer plate, omit the spring from the 2-3 accumulator (if the accumulator piston is plastic, find a old school aluminum piston that matches what...
  5. Matt69olds

    TransGo auto shift 4L80 transbrake kit

    I just got a email from TransGo promoting a transbrake valve body kit that retains automatic shifts for the 4L80. After reading the instructions, it appears you can set the brake is first gear, and then manually shift it, or set the brake in D3, it will then go thru the gears normally once the...
  6. Matt69olds

    1983 GMC K1500 electrical connector just above steering column near firewall identification help

    Before cutting and splicing anything, read the instructions again for the harness. I wouldn’t be surprised if there is a cavity in the fuse box for dash lights. If you don’t see anything in the instructions, call American Autowire.
  7. Matt69olds

    Transmission tunnel heat shield

    While we had the interior and drivetrain out of my son’s Yukon, we sprayed Lizard Skin vibration and heat barrier on both the top and bottom of the floor. Needless to say, it’s going to take a lot of time to remove the transmission and strip the interior to spray it. It seems to work well.
  8. Matt69olds

    Old school garage door opener remote

    I have a plan, unfortunately life keeps getting in the way of actually making it happen. When life slows down enough I’ll report back.
  9. Matt69olds

    Quadrajet adjustment mixture adjustment screws

    Or you can remove them and carefully cut a slot in them for a common flare blade screwdriver. Use a couple of pieces of scrap wood to protect the threads and tip, clamp them in a vice, and use a small cutoff wheel or hacksaw.
  10. Matt69olds

    4l60e - No Gears At All

    Crack open a transmission cooler line, DO NOT COMPLETELY REMOVE IT!! Have a helper start the engine, and make sure they are ready to immediately shut off the engine. If you don’t see ATF coming from the loose cooler line, either the converter is missing, its out of fluid, or the pump isn’t...
  11. Matt69olds

    "Oldsmobile Diesel" Conversion to gas

    The bolts that hold the cylinder head to the block changed, not the accessory bracket mounting bolts. The mounting bolts have always been 3/8x16. If I remember correctly, the later 350,403 and diesel engines used 1/2 or 9/16 head bolts.
  12. Matt69olds

    "Oldsmobile Diesel" Conversion to gas

    Yes, the bolt pattern on the ends of the heads are identical between all olds engines from 64-1990. The head bolt diameter changed on a couple engines, I think the late 70s 350 and 403, and the diesels. There is plenty of meat to drill the heads to accept the larger head bolts.
  13. Matt69olds

    Fuse Box/Panel in a 1991 GMC Suburban V1500 - I'm trying to identify wiring/fuse issue

    Pop one of the lenses off the vanity lamps. Use a 12v test light, see if one side of the bulb has power. If not, you know you have a power supply issue. I’m pretty sure the wiring for the vanity lights runs down behind the drivers side A pillar trim panel. Look for an orange wire, make sure...
  14. Matt69olds

    "Oldsmobile Diesel" Conversion to gas

    The water pumps, oil pans, and bolt on accessory brackets all interchange between the 260,307, 350, and 403 engines. I have owned a couple of 260 powered G body cars, driving a 260 will make you wish for the rompin stompin power of a 307!
  15. Matt69olds

    Struggling with my 700R4

    Agreed. The first generation (82-84) definitely had some flaws. In typical GM fashion, they kept improving it until it was just about perfected, then started over with a new model.
  16. Matt69olds

    Th350 behind 4.8ls

    Or use a carb on a LS!!
  17. Matt69olds

    Struggling with my 700R4

    The majority of problems are caused by people that don’t understand them, or know just enough to get into trouble. People think the can cobble together the tv cable brackets/linkage, and think as long as the cable is tight at WOT, all is good. And if all you did is drive at WOT, that would be...
  18. Matt69olds

    Struggling with my 700R4

    To expand on nicks advice, watch the pressure while you move the throttle. The line pressure needs to increase with throttle opening. I’m curious what tv cable kit you bought from Bow tie. Since these trucks came with 700 transmissions, and you are using a Q-Jet, you shouldn’t NEED a kit. At...
  19. Matt69olds

    Hard Line from fuel pump to carb

    LMC or Inline tube. Or make your own.
  20. Matt69olds

    Where to find transmission lines

    I’m glad I’m not the only one who has had that experience with them!! The people who staff the venders booths at the various races/car shows are obviously not the same people who work in the office. Several months ago I took a mini road trip all around Detroit, I left early in the morning so I...
  21. Matt69olds

    "Oldsmobile Diesel" Conversion to gas

    I agree, see if it will run before doing anything. It’s been my experience with those engines that they will either run forever, or die a quick death. My 81 GMC was also my grandfather’s truck. He died in 1991, several of my cousins occasionally used the truck. Not long after he died, it...
  22. Matt69olds

    "Oldsmobile Diesel" Conversion to gas

    Oh yes they are!! The later diesel olds 350 make killer race engines!! The later ones have larger lifter bores, meaning you can get much more aggressive with the camshaft. There are other advantages, I’m just not all that familiar with them. Bill Travato in Rochester New York set lots of...
  23. Matt69olds

    Brake/Signal Light Problem

    Push and pull the hazard switch a few times. Sometimes that gets rear turnsignal/brake lights going again. Check for power on the WHITE wire at the turn signal switch connector while pushing the brake pedal. If you have power on the white wire, check for power on the yellow and green wires...
  24. Matt69olds

    Full Rewire 1979 c-30

    Most of the options on GM vehicles of this vintage have individual harness that plug into either the fuse box, or a dedicated connector in the dash harness. In the case of the climate control, either the standard heat or the A/C harness will plug into the brown wire labeled Heater.
  25. Matt69olds

    305 serious sludge

    If you do use an additive to the oil to clean out the crud, definitely plan on changing the oil far more frequently than you normally would. All that crud will more than likely clog the filter.

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