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69 GMC C-15

Discussion in 'Other Vehicles' started by TravisB, Feb 26, 2019.

  1. DoubleDingo

    DoubleDingo Vacuum Leaks, The Root Of All Evil

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    Joined:
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    Location:
    A few hundred feet above sea level
    First Name:
    Shane
    Truck Year:
    1981, 1965
    Truck Model:
    81-C20 Silverado Camper Special-TH400-4.10s; 65-C20 with 4:57 gears and Borg Warner Overdrive
    Engine Size:
    Carb'ed Vortec 350; 1972 L48 350
    I think my tires were 30.7 diameter, and with the 3.54's it ran 70 mph at 2,600 rpms. For some reason that engine loved 3,000 rpms which put cruising at 80 and higher.
     
  2. TravisB

    TravisB Full Access Member

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    Joined:
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    Location:
    Kentucky
    First Name:
    Travis
    Truck Year:
    1978
    Truck Model:
    C10
    Engine Size:
    350
    I had been banking on my cousin giving this old truck a buff job and shining it up for the car show at the end of the month. I found out Saturday that wasn't going to happen. I have 0 experience but with as bad as the paint was I have wet sanded it with 2500 grit and got most the color even. I ordered a DA buffer and some compounds from chemical guys thanks to their handy videos on how to do this job and I hope I can make the thing shine again.

    I also need to rebuild the carb because it's started flooding when it's hot and fuel comes out both sides of the old Rochester 2 jet. I have a rebuild kit that should be here before the weekend and a buffer on the way. What a nightmare.

    Also, meeting a friend that works for Holley to tune that sniper on the Corvette this weekend so it will be an after work special to try and wrap this one up before next Saturday. We don't even have the sniper wired or the accessories going on that Vette. Not enough time in my days anymore.
     
  3. TravisB

    TravisB Full Access Member

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    Joined:
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    Location:
    Kentucky
    First Name:
    Travis
    Truck Year:
    1978
    Truck Model:
    C10
    Engine Size:
    350
    This is the rebuild kit for the carb. Looks like a bunch of universal stuff in here. Loose clips and check balls too. This could be a real treat :help:

    IMG_20190717_175927297.jpg

    I did wash the whole truck last night and ran a clay bar over the top since the white has held up much better than the teal or turquoise this truck was painted. Hopefully the buffer gets here today and I can make it look half way decent.

    What do you guys recommend for bringing the shine back to old chrome?
     
  4. DoubleDingo

    DoubleDingo Vacuum Leaks, The Root Of All Evil

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    Joined:
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    Location:
    A few hundred feet above sea level
    First Name:
    Shane
    Truck Year:
    1981, 1965
    Truck Model:
    81-C20 Silverado Camper Special-TH400-4.10s; 65-C20 with 4:57 gears and Borg Warner Overdrive
    Engine Size:
    Carb'ed Vortec 350; 1972 L48 350
    Rebuilding a carb isn't too bad. Just have to make sure you match the gaskets and other parts when there are extras in the kit.

    I just use chrome polish to polish the chrome on my rigs. Seems to work okay, but the chrome isn't crazy bad on them. Shines up nicely. I need to clay bar Crusty Biscuit, it looks good after a wax, I can only imagine what running a clay bar over it would do with a waxing involved afterwards.
     
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  5. CSFJ

    CSFJ ----------------- Supporting Member

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    I may be wrong, but I seem to recall hearing/reading that the th400 was developed before th350 was. Not sure on the year for the th350, iirc the th400 first showed up around '64. The other possibility, is that all the auto equipped trucks got the th400 regardless. I know the auto 'vettes all got the th400 until the big block option went away in '75.
     
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  6. DoubleDingo

    DoubleDingo Vacuum Leaks, The Root Of All Evil

    Posts:
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    Joined:
    Jul 3, 2012
    Location:
    A few hundred feet above sea level
    First Name:
    Shane
    Truck Year:
    1981, 1965
    Truck Model:
    81-C20 Silverado Camper Special-TH400-4.10s; 65-C20 with 4:57 gears and Borg Warner Overdrive
    Engine Size:
    Carb'ed Vortec 350; 1972 L48 350
    My '63 Shop Manual shows the automatic as a Powerglide. Now you got me curious. I now need to look at my '65 Supplement, and my '68 Shop Manual. I know in '68 the C20 Suburban's got the 396/TH400/Dana 60 (3.54) setup.
     
  7. TravisB

    TravisB Full Access Member

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    Joined:
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    Location:
    Kentucky
    First Name:
    Travis
    Truck Year:
    1978
    Truck Model:
    C10
    Engine Size:
    350
    I have washed this thing, clay barred it, wet sanded it with 2500, and now made one pass over it with a DA buffer + orange medium cutting pad + V34 from the chemical guys. It looks better than it ever has while I have owned it. If I follow their path, I am supposed to buff over that with V36 and then another round with V38 before finally wax and sealer.

    That will have to be a job for tomorrow. Waiting on my 2 buffer pads to dry out after washing out the polish. I have 9 days left if I count show day to finish. The carb is still on the truck for now.

    This is my attempt to show how the front half of the hood is buffed with the first round and the rest isn't. Crappy pic though.

    IMG_20190718_134656918.jpg

    The rest of these are all after the buff job with their v34.

    IMG_20190718_153931048.jpg IMG_20190718_153848183.jpg IMG_20190718_153837508.jpg IMG_20190718_153833514.jpg
     
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  8. DoubleDingo

    DoubleDingo Vacuum Leaks, The Root Of All Evil

    Posts:
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    Joined:
    Jul 3, 2012
    Location:
    A few hundred feet above sea level
    First Name:
    Shane
    Truck Year:
    1981, 1965
    Truck Model:
    81-C20 Silverado Camper Special-TH400-4.10s; 65-C20 with 4:57 gears and Borg Warner Overdrive
    Engine Size:
    Carb'ed Vortec 350; 1972 L48 350
    Looks good so far!
     
  9. DoubleDingo

    DoubleDingo Vacuum Leaks, The Root Of All Evil

    Posts:
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    Joined:
    Jul 3, 2012
    Location:
    A few hundred feet above sea level
    First Name:
    Shane
    Truck Year:
    1981, 1965
    Truck Model:
    81-C20 Silverado Camper Special-TH400-4.10s; 65-C20 with 4:57 gears and Borg Warner Overdrive
    Engine Size:
    Carb'ed Vortec 350; 1972 L48 350
    Here's the transmission stuff...

    1963... 20190718_131906.jpg


    1965....
    20190718_131550.jpg


    1968...
    20190718_132031.jpg
     
  10. 75Monza

    75Monza Full Access Member

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    First Name:
    Jeremy
    Truck Year:
    1986
    Truck Model:
    K20
    Engine Size:
    383
    When I got my 71, had a bad connection on the sender at the tank is why my gauge didn't work. Probably from storing stuff behind the seat. I bought the carpet kit that covers over the whole tank area behind the seat to stop that from happening again. On the heater, is it the actual fan that doesn't run? I had corroded connections at the switch and the resistor that I had to clean and then one of the slide levers was bent and would hit the switch in one direction so only had roughly two speeds. Can also have a bad ground on it too.
     
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  11. bucket

    bucket Super Moderator Staff Member

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    Truck Year:
    '77, '78, '79, '84, '88
    Truck Model:
    K5 thru K30
    Engine Size:
    350-454
    Iirc, the TH400 debuted late in the '65 model year, along with the '65 Caprice. I don't think the TH350 was used before '69.
     
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  12. TravisB

    TravisB Full Access Member

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    Engine Size:
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    Those have been on the to do list for a while. I've been busy working on the 78 and neglected this one. I'll hopefully get around tho those soon. I'll keep this in mind when I do. Thanks!
     
  13. TravisB

    TravisB Full Access Member

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    Truck Model:
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    Engine Size:
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    Well I went ahead and pulled the carb off. Tore it down and have half of it soaking in parts cleaner and will have to work the other half in after. Got one of those gallon of gunk parts cleaner with the little basket inside. We'll see how that works.

    It has a pair of 52s inside if anyone was curious. Looks like it was full of some rust and crud. My little sandstone filter isn't cutting it or that's just 50 years of collected sediment.
    IMG_20190718_190459816.jpg
    IMG_20190718_193822111.jpg IMG_20190718_194339047.jpg IMG_20190718_200514568.jpg
     
  14. TravisB

    TravisB Full Access Member

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    First Name:
    Travis
    Truck Year:
    1978
    Truck Model:
    C10
    Engine Size:
    350
    After a bath in the cleaning solution and a little air blast. Does anyone elses work bench look like a filthy mess of clutter? Hahahah

    IMG_20190719_212612771.jpg
     
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  15. TravisB

    TravisB Full Access Member

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    First Name:
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    Truck Year:
    1978
    Truck Model:
    C10
    Engine Size:
    350
    Good news gang! I put the carb back together, no left over bits to throw away outside of some extra gaskets and junk from the kit! Even better news, the carb is back on the truck, it started, and with a bit of monkeying with the idle air screws and the idle speed it's holding almost 17-19in-hg. No flooding anymore and it will start hot again!

    I should give credit to this guy for my success. I watched this video once on the tear down.
    Then I watched this video on putting it back together twice before I ever took mine apart and then watched it while pausing in places putting mine together.
    My carb isn't the electric choke model but it was nearly identical otherwise. My choke was activated from within the intake somehow. There is a rod coming up from the intake that works mine around. I assume some temperature spring that flexes when the engine is cold.

    Now all I think I am going to do is polish the chrome and give everything a top coat sealant and wax and call it quits.
     
    Last edited: Jul 22, 2019

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