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  1. S

    How to tell if my NP203 has been converted to part time?

    I don't see a CV, looks like a normal driveshaft with a u joint. Here's what it looks like.
  2. S

    How to tell if my NP203 has been converted to part time?

    Well, I found a stock 203 case not too far away for $100. Figure my best bet is to just get the stock one and have it rebuilt so I know it will operate as it should and sell this problem to somebody more willing to deal with modified stuff. Is the 1977 K10/K15 NP203 the 2 or 2.5" chain? I...
  3. S

    How to tell if my NP203 has been converted to part time?

    It's got superwinch hubs on it. I guess it's been converted since it moves in high with the hubs unlocked. Something is broken though, because I have no front axle drive in either lock position or low. Hopefully the shop can fix it. I just wanted to know if it had been monkeyed with before I...
  4. S

    How to tell if my NP203 has been converted to part time?

    Got a '77 K15. It's got the NP203, at least it should. I've got the low lock, low, neutral, high, and high lock on the shifter, but the truck has locking hubs. I've been driving the truck in high with the hubs unlocked, is that a good indicator that it's been converted? I have the truck up...
  5. S

    Steering column

    Question about the steering columns in these trucks. I've got a '77 GMC K15 4x4, and am looking to get a Flaming River steering column, or possibly Ididit. Flaming River offers 2 different ones, one doesn't give any specs and the other says it's for a 1" 48 spline output shaft. Ididit only...
  6. S

    1978-80 dash trim on a 1977 dash?

    Hopefully it will. If not, I'm just going to take the dash and my Grant steering wheel to a local cabinet shop and have them make me a custom solid wood trim piece to match the wheel. Truck has a really nice dash in it, I'm just going to dye it to match the other USA1 panels I'm getting... but...
  7. S

    1978-80 dash trim on a 1977 dash?

    Found this one that says it fits '73-80, so I guess I'll give it a try. Made in the USA to boot, so in my opinion, well worth the double price of the ching chong ones lol. https://www.cheyennepickup.com/collections/dash-plates/products/73-80-dash-plates I can get it with woodgrain and chrome...
  8. S

    1978-80 dash trim on a 1977 dash?

    Never even though to check there, dunno how I forgot about them! They have the walnut moulding, and it says it fits 78-80, so I may be out of luck. It looks like the actual metal structure behind the dash pad and frame was the same from '75-80, so I may just get a new dash pad/frame for a '78...
  9. S

    1978-80 dash trim on a 1977 dash?

    I'm re-doing my interior with stuff from USA1, and they don't have dash moulding (the piece that goes over the glove box from vent to vent on the passenger side) for the 1977 trucks. Anyone know if the '78-80 moulding would fit my '77 dash, or should I just buy a '78-80 dash from them? I'd...
  10. S

    Wiper differences

    Anyone know what the difference is between the '73-77 and 78-87 wiper systems? I got a painless harness for my truck, and it shows them as being different. It comes pre-wired for the '78+, but provides instructions to add different connectors for the older trucks. Would it be advisable to put...
  11. S

    Most complete lift kit

    Thanks, I'll give them a call.
  12. S

    Radio wiring

    Thanks!
  13. S

    A/C blower always running when key on

    OK, good to know. I'm new, but I'm not. My dad had an '83 Sierra Classic he bought just before I was born. Light blue/white 2 tone. Beautiful truck. I Grew up riding in it, learned to drive in it. Many happy memories in that truck. But he sold it back in 2003. Finally found a nice one...
  14. S

    A/C blower always running when key on

    Good evening all, and happy fathers day! While trying to find a switched 12v source, I noticed that my blower runs the entire time I have the key turned on (2nd notch, just before it cranks). Anybody know what could cause that? 1977 GMC K15 with factory air. I looked at all the connections...
  15. S

    Radio wiring

    Anybody have a wiring diagram for the radio in a '77? My truck has no radio now, and the wiring has already been cut so I can't just get an adapter. Thanks.
  16. S

    raising seat height

    Problem isn't that I'm too short, I'm average height 5'10". If I was too short, then I'd need the seet lowered, not raised lol. Looks like I'll be getting some new foam in the seat. And maybe raising it up as well. I have a Flaming River tilt column and a 14" Grant steering wheel coming for...
  17. S

    Blower motor

    Well, everything tested fine on the blower. I never even thought to check how hard it was blowing on the passenger side... it's coming out nice and hard over there, but the driver side is barely anything. Upon closer inspection, it seems that there's a big round duct that just dumps out behind...
  18. S

    raising seat height

    Hey all, Question about raising the height of my stock bench seat. I had forgotten just how uncomfortable the driving position is in these trucks lol. I gotta sit with my legs practically spread-eagle to drive this thing because the seat sits so low. I could wear a stovepipe hat in this...
  19. S

    Blower motor

    OK, thanks. Just wanted to be sure. It's been over 20 years since dad sold his '83, but I seem to remember it blowing harder than this one. On high, I can barely feel any air at all.
  20. S

    Blower motor

    Just making sure I completely understand, so to test for the ground I turn the blower motor on and put the red lead on my multimeter on the blower motor hot wire, and the black lead on something like the frame or negative battery terminal? And to test the voltage drop, you said to put one probe...
  21. S

    Blower motor

    Thanks, I'll check that.
  22. S

    Blower motor

    My AC blower doesn't really blow that hard in my 1977. Could this be a ground issue, bad switch, it just a tired old motor? Factory AC truck. Thanks.
  23. S

    Side tracking

    It's a 4x4.
  24. S

    1983 Chevy c30 bench seat upgrade

    Was this a good upgrade as far as comfort? Did the stock seatbelts work with the slots in the bottom cushion? I'm looking for something more comfortable for my '77. I drove 5 of these trucks before I bought this one, and all of them were exactly the same, my ass sank all the way down to the...
  25. S

    Power door lock conversion

    Finally found one. Took hours of googling lol. https://www.klassickeyless.com/product-p/06-01303-22.htm

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