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  1. Matt69olds

    Oil leaks

    Remove the breather from the other valve cover, start the engine. Put a small piece of paper over the hole in the valve cover where the breather went (opposite the PCV) crankcase vacuum should be enough to hold the paper in place with some noticeable suction. If not, the PCV system needs some...
  2. Matt69olds

    alternate High beam indicator light

    If you study the wiring diagram, you will see that the light green wire FROM the dimmer switch, and the green wire for the high beam indicator is spliced at the firewall electrical bulkhead connector (circuit 11). That means if the high beams work, the problem is NOT the dimmer switch. Most...
  3. Matt69olds

    How many times can wires flex?

    Yep! My truck is a 06, obviously they didn’t fix the wire issue! I fixed my door with a harness from a similar truck. The harness new wasn’t all that expensive if I remember, problem was it was backordered. Apparently lots of other people had the same concern
  4. Matt69olds

    Advice for rebuilding a 350 on a budget

    What’s the budget? That will be a huge determining factor. Can your nearest salvage yard. Around here, it’s easy to find late 80s-early 90s TBI engines. Call your local speed/machine shops. The ones around here sell rebuilt short blocks. It’s been years since I bought a remanufactured...
  5. Matt69olds

    Turbo 400 Filler Tube

    They are available at summit, JEGS, your local speed shop probably has one in stock. Autozone or advance auto could order them.
  6. Matt69olds

    Distributor bat terminal remote kill switch/

    https://www.autozone.com/exterior-lighting/safety-lights/p/dorman-conduct-tite-red-alarm-led-light-indicator/595406_0_0 For the money, it’s hard to beat this. It will at least make the thief question if it’s really worth the risk. Put the positive wire of the LED on the orange wire that feeds...
  7. Matt69olds

    700R4 that only mildly backs up at 1200 rpm

    https://www.thirdgen.org/forums/transmissions-drivetrain/743902-700r4-reverse-piston-modification.html
  8. Matt69olds

    700R4 that only mildly backs up at 1200 rpm

    There is a bleed hole in the reverse input clutch piston, from the factory the hole is a little too big. TransGo include a tiny freeze plug with a very small orifice that make the bleed hole smaller. You can buy the freeze plugs from TransStar and other venders. Put a pressure gauge on it. TCI...
  9. Matt69olds

    4L60e vs 700r4

    Find a different shop!! There is no reason a 700 won’t live behind a 450hp engine if it’s built right. I’m kinda curious what parts and upgrades they are doing, what the failure is, and what the line pressure is.
  10. Matt69olds

    4L60e vs 700r4

    A late model 700 (like what you have) and a 4L60E are basically the same internally. The clutch packs, planetary gears, shafts etc are almost identical. Other than the electronics, there is no advantage. If you’re planning to rebuild either, have done upgrades done. Use a wide 2-4 band, Sonnax...
  11. Matt69olds

    700R4 that only mildly backs up at 1200 rpm

    Find a gauge that reads to 300 psi, put it in the line pressure tap about the manual linkage. See what the pressure is in reverse. It isn’t normal to need to rev the engine to back up. Have you driven it yet? If so, get it up to 30mph, put the shifter in 1st, see if it has engine braking...
  12. Matt69olds

    700R4 that only mildly backs up at 1200 rpm

    If it’s a new transmission, I wouldn’t do anything until you talk to TCI. Make absolutely sure you have followed their installation instructions to the letter before calling them. I’d be curious to know what they say.
  13. Matt69olds

    Electrical Issues

    I’m not exactly sure how the brown exciter wire works on a truck with a volt gauge and no idiot light. The way an alternator exciter circuit works with a light is ignition power goes to the idiot light, out the light on the brown wire to the alternator. That’s what the regulator sees to know the...
  14. Matt69olds

    Electrical Issues

    You need a much larger fuse than 15 amps to replace a fusible link. I wouldn’t be surprised if you find the fuse blown. Take the fuse out, install the correct gauge fusible link. If you absolutely insist on a fuse, you’re probably going to have to use a MaxiFuse and the proper holder for a 40...
  15. Matt69olds

    th400 electric speedo

    Well crap. I’ll do some digging.
  16. Matt69olds

    th400 electric speedo

    https://www.summitracing.com/parts/rnb-917-632 https://www.jegs.com/i/FTI-Transmissions-Converters/107/FSP40R/10002/-1
  17. Matt69olds

    truck idles fine dies when put in gear

    https://www.jegs.com/i/Crane-Cams/271/99600-1/10001/-1 If you’re patient, and don’t mind fabricating tools and parts, you can make and adjustable vacuum advance stop. If the canister adds 20 degrees of timing, and you mechanically prevent the canister from relaxing all the way, you puke drop...
  18. Matt69olds

    truck idles fine dies when put in gear

    Do you have the vacuum advance connected? If so, disconnect it while the engine is running, is there a huge drop in rpm? If so, you need to rework the vacuum advance. Don’t leave it disconnected, if you do you’re missing out on a huge improvement in part throttle drivability and fuel economy...
  19. Matt69olds

    87 Stock TBI 350 air cleaner lid flip upside down? Does it help? does it hurt? good or bad idea?

    I’m betting the airflow needs on a mild small block are easily handled by the air inlet. Automakers spend millions on testing trying to find the best compromise between cost, noise, power and emissions. Flipping the air cleaner lid more than likely does hurt power. Probably not enough that the...
  20. Matt69olds

    Batteries

    There are only a couple battery manufacturers left, all the different brands are just different levels of the same product. I buy batteries from Autozone or Walmart. If your 10 miles northeast of nowhere and have battery issues, warranty replacements won’t be far away. You can find a autozone...
  21. Matt69olds

    I cant get my new engine to run smooth. Seems untunable.

    Make sure the weights in the distributor are free to move. If they stick in the advance position, it will idle fast. Is the secondary throttle hanging open a little? Not the air door on the top, but the lower one. I worked at a Cadillac dealership years ago, 90 year old guy brought in his 70...
  22. Matt69olds

    4l80 swap question

    It just dawn on me you want to bolt the 4x4 trans and transfer case into a 2wd truck and not use the front driveshaft? I suppose you could, but if you’re wanting the LS engine for the added powere, why handicap the truck with a couple hundred pounds of extra weight? If you have a known good...
  23. Matt69olds

    4l80 swap question

    Quick google search shows 5 different output shafts. The 4x4 shaft is several inches shorter, meaning even if the spline count is the same, there is no way to put a yoke on it once the extension housing is installed.
  24. Matt69olds

    4l80 swap question

    Here is the tone wheel. GM calls it a reluctor wheel. I have 2 4L80s torn apart right now, both are 2002ish center lube models, one 2wd, the other 4x4. The 4WD does not have the pickup for the rear speed sensor. Maybe GM felt generous on certain day?
  25. Matt69olds

    4l80 swap question

    Pretty sure the output shafts are different lengths. I’m not a 4x4/transfer case expert, but I’m almost positive the shafts are different. Another headache, and one I’m all too familiar with is the lack of the tone wheel for the rear speed sensor. I assume GM decided not to put the tone wheel...

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