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  1. 75gmck25

    Frame mounted Trailer Hitch for Step bumper

    It’s been a while since I searched for one, but vendors used to sell frame hitches that were specifically designed to work with a step bumper.
  2. 75gmck25

    Chevy Replacement Grill with 350 emblem option

    75 also had it. Not sure when it stopped.
  3. 75gmck25

    Quality replacement steering box

    I checked the Detroit Speed web site and all steering boxes listed were for 2WD.
  4. 75gmck25

    Quality replacement steering box

    I had forgotten about the Borgeson steering gear. Expensive. but at least it’s new. One concern I have is that they show the applicable parts number to be for a K10, and I have a K25. I always thought the steering gear was the same for both 1/2 ton and 3/4 ton 4WD. The Red Head is a rebuilt...
  5. 75gmck25

    Quality replacement steering box

    I’ve gone through rest of my 1975 K25 front end, and now it’s time to get some of the play out of the steering box. There seems to be multiple alternatives, and I want to get it right the first time. - buy a kit and rebuild mine (about $40 for the kit). However, I don’t have any knowledge...
  6. 75gmck25

    Double cardan ball

    Could the assembly possibly be pressed in, like a ball joint?
  7. 75gmck25

    Single din install problem

    Cutting the old dash to install a DIN style radio was popular when folks wanted to have space for a CD or MP3 disc player. Now most drivers use Bluetooth, USB memory stick, XM radio or other ways to access a large number of songs. Your dash is less molested than most, so I would just use a two...
  8. 75gmck25

    Interior light mystery

    To add to Fast 99’s explanation, the dome light circuit works differently than other circuits in the truck. It has constant power, and the ground is switched. - Orange wire always has power for the dome lights, truck bed light, etc. - white wire is the ground for the circuit. The door...
  9. 75gmck25

    Factory charge wire gauge

    Question for CalSgt - are those exhaust manifolds just stock and very clean, or are they aftermarket?
  10. 75gmck25

    Double cardan ball

    I replaced that part in the front driveshaft of my ‘75, and don’t remember it being very hard. I’ll have to take a look at the manual again to see how it came apart. However, mine had completely self destructed, so maybe that made it easier. It appears that the ball assembly was bolted on my...
  11. 75gmck25

    Factory charge wire gauge

    I just left the stock charge wire in place, and added an 8 gauge wire (with 12 gauge fusible link) running directly from the battery positive to the Bat terminal on the alternator.
  12. 75gmck25

    Cargo and Dome not working

    The wires run under the kick plate on the drivers side door. Insulation got very brittle on mine and I had to replace that section of wire.
  13. 75gmck25

    First time replacing intake manifold gaskets

    My engine developed a noticeable tick, and I used an engine stethoscope to determine which cylinder. Pulled the valve cover and it turned out to be a polylock on the rocker that loosened up and it was the pushrod rattling. Sometimes a very small exhaust leak can also sound like a tick. Check...
  14. 75gmck25

    First time replacing intake manifold gaskets

    It’s part of the hot air choke on a Quadrajet. The choke mechanism has a couple small tubes that connect to that device, and it pulls air through it to heat and operate the choke. It’s not needed if you have an electric choke. IIRC, my Edelebrock intake came with a choke block-off plate for...
  15. 75gmck25

    New guy with a ton of general questions...

    My camper wiring harness is a separate wire bundle (brake and turn signal wires, and ground) that runs from the engine compartment down along the drivers side frame rail to a point under the bed. At that point it would have been connected to the camper wiring. I assume that trailer wiring...
  16. 75gmck25

    85 K20 4X4 6.0 6L80E swap. What are my fuel delivery options. Rear tank?

    You can buy rubber EFI fuel hose, spec SAE J30R9, and it is rated for up to 100 psi. It also holds up well to ethanol fuel. The 87 tank option should work fine, but you will need a pump in each tank, and the switching valve for dual EFI tanks.
  17. 75gmck25

    Power steering pump

    The stethoscope I have has a tube on the end, and a couple extensions.So far I have only used it to track down a tick from one lifter. Turned out the adjusting nut had loosened.
  18. 75gmck25

    First time replacing intake manifold gaskets

    Definitely remove the plugs if you plan to turn it over by the crankshaft bolt. You do not want to strip that bolt. You can also use a tool to turn it over by the flywheel teeth, after you remove the inspection cover. Or you can get a tool/gadget that bolts onto the three bolts on the...
  19. 75gmck25

    Hello. And weight Q for title in Texas.

    The info is out there in some book, but I can’t tell you exactly where. As a reference, my 1975 3/4 ton K25 goes across the scale with two passengers at about 5300 lbs, so empty is probably about 4900-5000 lbs. My guess is that your suburban would probably run about 500 lbs heavier than a pickup.
  20. 75gmck25

    454 460 horsepower swap into a 1987 V10 with 700r4

    That’s a lot of horsepower for a 700R4 unless it’s been beefed up quite a bit. You need to talk to a transmission builder. I am surprised you could get a 454/460 HP with that mild cam unless it also has other significant upgrades. Are you sure of the engine specs? I would also look for gears...
  21. 75gmck25

    Do I need an Alternator upgrade?

    I assume that by ‘86 the 94 amp was common. However, even the original 63 amp on my ‘75 was an option upgrade that I think was included with A/C. The 10si maxed at 63 amp, so if you have a 78 amp it is a 12si. Both will mount and wire in the same. Take a look at the madelectrical.com site...
  22. 75gmck25

    Do I need an Alternator upgrade?

    Doesn’t sound like you need it. I’m using a 94 amp 12si right now, and never see any evidence that it’s not enough. I added the relay wiring kit to my headlights, which was the only high amperage thing on my truck. Higher amp alternators are needed to support big driving lights, high...
  23. 75gmck25

    I'm sure it's an age old question, K 20 ride quality improvements.

    My K25 is 8600 lb GVW, and it definitely rides better with about 1000lbs in the bed. In that era GM did not use any type of factory progressive overloads, so the full GVW load capacity is there all the time. It’s great for hauling loads.
  24. 75gmck25

    AC Head Control Options

    If you mean the dash controls, I don’t think total aftermarket would work. The replacement controls from LMC and other vendors do not include the large molded plug on the back of the controls, and that is where the vacuum lines connect. On an A/C truck all the blend doors are vacuum operated...
  25. 75gmck25

    EFI rated fuel plumbing solution

    J30R9 is a specification/rating, not a brand or hose design. It’s rated for 100 psi pressure, and resistance to the new fuel. It looks a lot like regular fuel hose, but is a little harder to bend. J30R7 rated hose also handles the new fuels, but is for max 50 psi EFI.

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