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    Allow cranking, but prevent starting

    Hi, how can I crank my engine ('79 350 H.E.I.) without allowing it to start? Is there a fuse or a cable to disengage the ignition when cranking the engine with the starter? Thanks!
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    EFE-System

    On my '79 K25 350 I had to remove the vacuum-actuator of the EFE, because it doesn't work anymore. Now, with the actuator completely removed, do I have to lock the heat valve in the exhaust-manifold, to stay in the open position (towards the rear), or will it stay open due to the exhaust...
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    Replacing mirrors

    Hi all, I want to replace the large mirrors on my '79 K20 with the smaller ones. Do I have to drill new holes or can I use some of the existing holes. Do I have to modify anything else? Thanks!
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    Short brake hose?

    Hi all, my mechanic lifted my 1979 K25 on a hydraulic ramp (under the frame). Then he told me, that the rear brake hose was too short, because it was so tight, that it seemed, it was holding up the rear axle, when the truck was lifted on the ramp. I believed him and ordered a new rear brake...
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    I twisted my fuel line...

    Hi, while trying to change the fuel filter, I twisted my fuel line a little . Do you think, it has to be replaced? If yes: does anyone know the OEM-Partnumber for the fuel line (1979, K2500, 4 barrel Quadrajet). I searched for hours, but I cannot find this part in the parts catalog or the...
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    1979 K25 with gauges - Indicator Lights

    Hi all, my 1979 K25 has gauges (Volts, Oil Pressure, Temperature). When I switch on the ignition, only the "Seat belt" and "Brake" indicator lights below the fuel gauge light up. I wonder if there are other indicator lights (Generator, Oil pressure, Temp.) installed but not working on my...
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    Which bulb?

    Hi, does anyone know, which light bulb fits these cargo lights (installed on my 1979 GMC K25)? The distance between the two connectors (marked in red) is about 1.7 inch. Thanks!
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    What is this cable for?

    Hi, I bought a 79 GMC K25. It seems, that it was once equipped with a dual battery setup. However someone removed one of the batteries and some of the cables. But there is still a "Divi-Charge"-Device left, which is connected to an unfused red wire that comes directly out of the alternator and...
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    What is this part?

    ...See picture. Thanks!
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    Is that the horn relay?

    Hi, is the white box in the upper part of the picture the horn relay? Thanks!
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    Hood liner: Asbestos?

    Hi, can anyone tell me, whether this two parted hood liner in my 1979 GMC K25 (Californian Truck, Fremont Plant) is the factory installed original part? If yes, what are the chances, that it contains asbestos? Thanks!
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    1979 K25 Automatic NP203 or NP205

    Hi, I'm about to buy a 1979 GMC K25 . I read, that the 1979 Automatics had Full-Time 4WD and the NP203 transfer case. But this one has manual locking hubs on the front wheels and the transfer case lever has four positions: 4L, N, 2H, 4L. Did GM switch to the NP205 during the model year 1979 or...

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