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  1. Mlcdc1

    TH 350 shift issues

    kickdown cable is working ok. Have driven with it unhooked and makes no difference.
  2. Mlcdc1

    TH 350 shift issues

    Has the hard line except at manifold connection and modulator cennection
  3. Mlcdc1

    TH 350 shift issues

    Thanks for the input. The fluid is good and there are no apparent kinks in the lines. Adjustment with the modulator screws doesn't seem to affect the issue either way. There isn’t a leak on the line.
  4. Mlcdc1

    TH 350 shift issues

    shifting issue with TH350-Shifts great until it gets warmed up and then intermittently will shift down into lower gear or not shift up after a stop. I had a rebuild on it about 2500 miles ago and returned to the transmission shop, had it checked and they say it’s working fine. I recently...
  5. Mlcdc1

    AFR Gauge Confusion

    Thanks for the input. I’m running 4.5-5 of fuel pressure.
  6. Mlcdc1

    AFR Gauge Confusion

    Trying to set up an Edelbrock 1906 on 1977 GMC with 350 (all stock) and confused about what AFR gauge is telling me. At idle (750 rpm) it reads anywhere from 12-12.6. At cruising, (1800 rpm @ 60mph) it reads 14.2-15.0. I have not been able to get close to 14.6 at idle by changing rods in the...
  7. Mlcdc1

    Help identifying wheels

    Picked up these wheels for a possible change over on my 1977 GMC C15 but now not sure I’ll make the change. They are 15x7, 5x5 with a 4.5” backspace and came with beauty rings. I am wondering if anyone can provide information on what the original application would have been for them. I was told...
  8. Mlcdc1

    Brake Warning Light GMC C15

    I appreciate the responses. No switch on the e-brake on a 1977 so think that doesn’t figure into it. My understanding is that when the ignition is in the on position or when starting the engine, the light should light up as a bulb check and then go off after engine is running. I get no light in...
  9. Mlcdc1

    Brake Warning Light GMC C15

    Recently noticed the brake warning light on the dash of my 1977 GMC C15 did not light up when engaging key in on position. After reading other threads, I was able to activate the light by removing the wire from the proportioning switch and grounding it, which if I understand it right...
  10. Mlcdc1

    TH 350 shift issues

    Thnaks for the advice. I will pull the vac module and the module valve and see what I find. Am I correct in that the valve will just pull out once the module removed?
  11. Mlcdc1

    TH 350 shift issues

    Symptoms - nice smooth shift from 1-2 at what I would consider normal RPM (no tach available so not sure of exact). Shift from 2-3 occurs about 1/4 of the time and at all other times, the RPMs are high and no shift. I can sometimes get a shift by backing off the gas and then reapplying throttle...
  12. Mlcdc1

    TH 350 shift issues

    I have reviewed several posts on this issue and have found them to be a great value - unfortunately I still am having an issue with the 2-3 shift on my 1977 GMC heavy half 2wd pickup (1-2 shift is good). A little background- I recently finished a 1 year rebuild of the truck but did not touch the...
  13. Mlcdc1

    Bed side seam sealer

    just finished installing new bed sides on my '77 and looking for recommendations for a good bed sealer to fill the seam with the floor that's user friendly - suggestions?
  14. Mlcdc1

    Vent window seal

    Replaced the seals on my '77 vent windows and getting ready to reinstall them in the door. Question is should the rubber seal fit between the window frame and inside the door frame or does it fit on the outside. Forgot to take notice when I took them apart. Thanks
  15. Mlcdc1

    '77 GMC Electrical Issues

    Bebuilding my '77 GMC pickup and pulled the old wiring harness (painless wiring #10205) from the cab and installed it in the new cab. I didn't add any extras and used the components (steering wheel, switches, etc) from the old cab. When I tighten the wiring module to the fuse block under the...
  16. Mlcdc1

    Dash Panel

    Beginning restoration of 1977 GMC 1/2 ton with a cab off a wreck. Cab is in decent shape but part of the metal dash panel has been cut out because of the wreck. Question-any suggestions on locating one or how hard would it be to remove one in a cab at a salvage yard?
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