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    77 C10 HVAC vacuum line replacement through firewall

    The vac routing diagram I attached earlier was for a C60 model. Here is the correct one for the C-K10 models.
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    77 C10 HVAC vacuum line replacement through firewall

    A friend had some and the 1/16" is the size in my engine compartment. I've removed some ducts and can feel where it goes through the firewall. My biggest problem now is separating wiring and the vac line at the firewall. I was hoping this wasn't going to turn into a PITA, but that's about par...
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    77 C10 HVAC vacuum line replacement through firewall

    I forgot to add a vac diagram. It looks like the single line goes to the head unit, so hopefully that will help
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    77 C10 HVAC vacuum line replacement through firewall

    I have my line 'fixed' for the time being, but it is very brittle. I took another look behind the globe box and it's not as easy as you'd hope to get at the line at the FW. It appears it's about 3" lower than the top of the black box with the cores. I hope to pull the HVAC control head...
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    77 C10 HVAC vacuum line replacement through firewall

    Great idea! Mine is broken in the engine compartment so I will just do the repair/replacement there and be done with it, thanks! I already pulled the glove box and saw the vac lines up there, but was unable to determine where the line went through the firewall. It looks like it's behind the...
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    77 C10 HVAC vacuum line replacement through firewall

    My vacuum line from the reservoir tank in the right rear corner of the engine compartment through the firewall needs to be replaced. What is the easiest/best way to get to the opposite end of the vacuum line inside the cab? Thank you!
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    6 x 9 speaker mounting in door

    I forgot about my ~3' long tapered plastic shelf behind the seat so there is no room for laying down speakers. I just ordered these stand up enclosures off Amazon which should give me just enough room for the speakers and my shelf
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    6 x 9 speaker mounting in door

    Hmmm, never thought about that option. Another great idea. Thanks!
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    6 x 9 speaker mounting in door

    Another great idea, thanks! Since I want to run new speaker wire I'll probably abandon the door speakers and go with enclosures behind the seat. It will be much easier to run the wire through the sill plate than the rubber tunnel between the door and cab. If I do my wires long enough I can...
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    6 x 9 speaker mounting in door

    I like that idea and I bet they sound good with the speakers pointing up to get the sound out from behind the seat. I've never built enclosures and may be able to find some already built. Thanks!
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    6 x 9 speaker mounting in door

    I was not aware that the stock speaker location is in the rear cab corners. That appears to be an excellent location. However, I read about the corner mount speakers and they don't work if your seatbelt retractor is mounted in that area. Unfortunately, my retractors mount in this location (I...
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    6 x 9 speaker mounting in door

    Yes, but if you are outside and want to listen to music, all you have to do is open the doors. I agree, the rest of the time, a horrible location to blast music right into the side of your seat :(
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    6 x 9 speaker mounting in door

    I had an older Marantz radio in my 77 Silverado years ago and I was very pleased with the setup until it crapped out. It had 6x9 speakers in the rear of each door and 4.5" in the kick panels. The door speakers were mounted behind the metal so the lower door panel cover didn't need cutting...
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    Modern trailer controller wiring details

    I'm having a problem on my 77 Silverado C10 with a Tekonsha P3 controller. When I step on the brakes, the trailer brakes don't apply and the controller display shows 0.0, but when I let off the brakes, the numbers on the controller bounce around and you can feel the brakes applied. I talked to...
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    Fuel economy C10 with carb

    My 77 gets ~ 13 mpg with a stock 4 barrel Rochester, 350, and 400 trans. I'm more interested in gas mileage now so maybe I need to look into a Roch 2 barrel??? Would you know of a specific carb # that would be a 'bolt on' swap or is it that simple? Thanks in advance!
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    4 sail section

    I don't even see a for sale or sail section to look at goodies. Maybe it doesn't show on a phone, but only on a computer???
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    Sirius/XM "Roady" with original GM truck radio

    I installed an FM modulator from Crutchfield for under $30 in another car and it works well. It was easy to install and use. When you want to listen to XM, you just tune the radio to a specific station. The only difference would be is if it would work as well with an old analog radio as...
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    Glove Box Repair

    Great job of thinking outside the box and trying multiple options. I hope to get a 3D printer one of these days...
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    Spark plug wires

    I have a stock 77 350. I'd like to route a new custom 'cut to length' set of wires like this, but I want the nipple for the dist retainer ring and 90 degree plug ends. I'm having a hard time finding that combination. I found one set like this, but they are 10mm wires and I can't find a crimper...
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    Build your own spark plug wires?

    I have a stock 77 350. I want to get a new custom set of wires that have the nipples that fit in the distributor retainer ring, route the wires behind the block, along the sides of the block, and end with a 90 degree boots at the plugs. I found the exact 'cut to length wire' kit on Amazon but...
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    1977 C10 Silverado

    Welcome from Central TX! I've had my 77 Silverado for 45 years now. Even though it doesn't look pretty, I still love it!
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    Newbie

    Welcome from Central Texas!
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    Broken hearted kid and fuel system

    Hopefully your fuel pumps come with a warranty so at least you don't have to pay for one each time... Another thought is IF you all know of someone with a good working FP, try swapping what you think is bad with a known good pump and see what happens on both trucks. I realize you need a real...
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    Breaks come on hard when coming to stop sign

    I had a similar issue on my 77 C10. I found my bad rubber line by jacking the wheel up off the ground, apply and let off brake so the wheel hangs. Then start cracking the brake hose fittings loose until you are able to turn the wheel. That should tell you where the obstruction is. I had a bad...
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    Cruise control works for a while then starts to lose speed

    The cruise on my 77 C10 functions similar with losing speed going uphill. If I help it by manually pressing on the accelerator, once I get over the hill, it picks up speed like I've got a new 'setpoint' for the cruise to maintain. I rarely use cruise so I've lived with it, but this thread has...

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