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  1. Matt69olds

    91 Suburban Rear Speaker - Which Ohm?

    We replaced all the factory speakers in my sons 91 Yukon with aftermarket speakers. We also sent the factory radio off for repair (3 times!) each time it came back with a different issue. Don’t use M&R electronics in Michigan for your delco radio repair!! The radio itself seems ok, they just...
  2. Matt69olds

    truck runs hot

    Make sure all the rubber fillers and plastic shrouding is in place around the radiator. Any air that enters the grill needs to exit thru the radiator. Air will take the path of least resistance, if it’s easier to go around the radiator than thru it that’s exactly what it will do. Fill any...
  3. Matt69olds

    1983 454 vs 5.3 LS for towing

    If you are towing, go big block all the way. The lamest 454 will have more off idle torque than any stock 5.3 LS. As for the 700, run it until it gives you trouble. Hopefully the shop that did the build included some durability upgrades. Specifically, an upgraded 3-4 clutch pack, and some...
  4. Matt69olds

    1977 C10 Silverado 350/T350 - reverse issue

    Pour an extra quart of fluid in. If that solves the issue, drop the pan and verify the full mark is even with the pan rail.
  5. Matt69olds

    TH350 5 neutrals (delayed shifting/won't go into gear)

    Gear command is TransGo speak for manual/auto valve body. Put the shifter in drive, it will shift normally. Put the shifter in 1st, is going into first regardless of vehicle speed. Start out in first, thr trans will stay on first until you move the shifter, or you drive over the crankshaft...
  6. Matt69olds

    TH350 5 neutrals (delayed shifting/won't go into gear)

    Be conservative on the hole size. It’s easy to make it bigger. Can’t make the hole smaller. And if the accumulator piston in the valve body is plastic, replace it with an old school aluminum piston. If it hasn’t broken yet, it will when you compress it to remove the e clip. The fact that you...
  7. Matt69olds

    TH350 5 neutrals (delayed shifting/won't go into gear)

    Piece of copper tubing in place of the spring is what I use. Pull the valve, remove the spring, put a piece of tubing in place, reinstall the valve and you’re done. If the roll pin won’t fit, take a punch and LIGHTLY tap the valve to compress the copper tubing until the roll pin just fits...
  8. Matt69olds

    TH350 5 neutrals (delayed shifting/won't go into gear)

    That transmission has had some water in it at one time. That’s what valve body gaskets look like after soaking in a ATF/water bath for a while. The B&M kit severely restricts accumulator function, and is a little more aggressive with spacer plate drill sizes. I actually prefer the B&M kit IF...
  9. Matt69olds

    TH350 5 neutrals (delayed shifting/won't go into gear)

    Before putting the pan on, verify the dipstick is correct. The full mark should be even with the pail rail.
  10. Matt69olds

    Carb not getting fuel

    Either crank the engine long enough to fill the carb, or put a little fuel down the carb vent to fill the bowl.
  11. Matt69olds

    The old 700R4 questions!

    Finally, someone with a clue. The 700 trans came out in 1982. You have to understand the way GM was run in those days. All the real car guys had either left or were on their way out, and were replaced by bean counters. Unfortunately, GM engineers were more concerned with meeting emissions and...
  12. Matt69olds

    The old 700R4 questions!

    You have 4th gear without the wiring. What you don’t have is a locking torque converter. Use a continuity tester to determine if the pressure switch is normally open or closed. TCI, Painless wiring, all make lockup kits of if you don’t want to make your own. bow tie overdrive makes a really...
  13. Matt69olds

    4L60 limitations

    Just to clarify: a 4L65E has 6 clutches in the 3-4 clutch pack. The 4L70e has 7 clutches, planetary gears with 5 pinions instead of the usable 4, and the updated dual cage input sprag. If you install the 5 pinion planetary gears, make sure you are buying GM stuff or qualify parts. I did a...
  14. Matt69olds

    Overdrive not working

    That’s about all the movement you will see. If you still have the old solenoid, drive a bb or something similar in the end of the solenoid. Reinstall the solenoid, filter, pan, fluid, etc. With the solenoid blocked with a bb the converter should be locked, as soon as it shifts to second gear.
  15. Matt69olds

    Overdrive not working

    The TCC valve is directly above the solenoid. Have you air tested the solenoid? If you apply air to the end of the solenoid, air should vent. Apply power the the solenoid, the vent should close.
  16. Matt69olds

    Fuel Pump?

    It’s been years since I bought a Airtex pump. It would not surprise me to learn they are outsourced and junk today.
  17. Matt69olds

    Fuel Pump?

    The problem with an American made A/C Delco pump is it will have been made long before the rubber parts were made with ethanol compatible components. Not to mention A/C Delco today is a not the same as A/C Delco of 30 years ago. I’m a believer in keeping your “GM vehicle all GM” but it’s not...
  18. Matt69olds

    WTF is a Hobbs switch???

    The problem is the amount of torque that one inch of friction material can handle before it begins to slip. With a torquey engine, it’s pretty easy to slip that clutch, which creates heat, which causes the friction material to glaze and eventually flake off, which begins to clog the filter...
  19. Matt69olds

    LS swap transmission choice

    Just make sure you are buying GM 5 pinion gearsets. The China versions are made from glass.
  20. Matt69olds

    WTF is a Hobbs switch???

    Very few factory style converters have the clutch surface area to allow WOT with the converter locked. That’s why multi disc converters became popular. Unless the converter is built for it, keeping it locked at WOT will almost certainly smoke it. The friction band on a typical converter is...
  21. Matt69olds

    5.7 to 6.2 diesel engine

    Swap in a 455 Olds!! That is the EASIEST swap. Keep the frame mounts. There is a market for them.
  22. Matt69olds

    4L60 limitations

    If you are going with a 5.3, look for a 4L60E. Use the computer to control it. I build my 4L60/4L60 with the same basic recipe. Install the upgraded dual cage input sprag, use the factory 7 clutch setup for the 3-4 clutches, use a wide 2-4 band (make sure the reverse input drum is absolutely...
  23. Matt69olds

    Overheating climbing a mountain

    Hopefully you were trying to fix a problem that wasn’t really there. Only thing I would add to the discussion is shrouding and baffles. Make sure the radiator seals are in place and fit tight against the core support. Make sure any air that enters the grill has to go thru the radiator.
  24. Matt69olds

    Vac Advance - Yes or No?

    I ram my sniper the first year with the HEI and vacuum advance functional for the first year while waiting on Holley to release the Oldsmobile version of thier distributor. It worked just fine. If the distributor has an advance curve that works well, run it with the advance connected.
  25. Matt69olds

    Automatic transmission newbie asking basic questions

    Make sure the engine reaches operating temp. Make sure the cruise/TCC switch is adjusted correctly. Pretty sure those trucks have 2 brake light switches, one for the brake lights, one for the cruise/TCC. Just as a cheap/easy diagnostic aid, next time it acts funny, pull up on the brake pedal...

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