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  1. 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...
  2. 75gmck25

    Header fitment and exhaust routing with NP203

    My ‘75 K25 has a TH350 and NP203, and I’ve got stock exhaust manifolds and dual exhaust. Space for the exhaust pipe is ample on the drivers, but really tight on the passenger side because of the shape of the crossmember braces for the NP203. I’ve got a 2 1/4” pipe fit through there, but with...
  3. 75gmck25

    Recommend touch-up paint source

    I want to clean up some rusted areas on the rocker panels and then spray matching touch-up to make it less obvious. I would prefer rattle can spray paint, since ita a small area and I’m not set up with the right equipment to use my compressor to spray. I need ‘75 vintage, GM color 62 light...
  4. 75gmck25

    Emergency brake warning light

    My ‘75 GMC brake warning light comes on if there is a pressure imbalance in the brake proportioning valve (as designed), but there is no warning light to remind me if I leave the park brake on. Was there a park brake warning light in any of the squarebody trucks? All years 73-87 seem to have...
  5. 75gmck25

    '75 K25 Front Leaf Spring Bushing replacement - bolts stuck

    I purchased a set of poly bushings for the springs on my '75 GMC and have started with the front bushing for the front springs. Truck is jacked up by the frame and the wheel on that side is hanging about an inch off the ground. I have a jack under the axle housing to take tension off the...
  6. 75gmck25

    Need info on Quality of LMC "Premium" Hood

    I'm planning to replace the hood on my '75 GMC K25 and I'm looking at the choices. Here are a few examples. - $159, LMC Truck standard hood - $193, Summit and Jegs, Autometal Direct X300-4073 - $372, Jegs, Key parts 576-0850-030 OE Style Hood - $439, LMC Truck Premium hood (supposed to be 18...
  7. 75gmck25

    Adjusting side windows

    My passenger side manual roll-up window has always been tough to roll up, especially if its been rolled all the way down. I ordered a new regulator and all new window felt, and just finished putting it all back together yesterday. Bottom line - its still hard to roll up that window! I cleaned...
  8. 75gmck25

    Truck makes clicking noise while driving

    75 GMC K25, 350/TH350/NP203-unconverted When driving forward there is a low volume clicking sound from under the front of the truck. Its frequency is related to road speed, not engine speed. My wife described it as sounding like a baseball card flapping in a bicycle wheel spoke, and that's...
  9. 75gmck25

    What gaskets are needed for stock exhaust manifolds

    I installed a new set of heads, and now I have an exhaust leak on the passenger side where the heat riser is installed on the stock manifold. Clearance is tight around the flange, but I think I got it tight. When I pulled off the manifold there was no gasket between the heat riser and the...
  10. 75gmck25

    Using Jeep steering shaft to improve square body steering

    I've read several articles about using a Jeep Cherokee steering shaft to replace the shaft and rag joint in a square body. However, then I ran across one post that said the replacement won't work with a '79 and earlier GM truck because the steering shaft is different (splined?). Anybody have...
  11. 75gmck25

    New GM 350 Vortec roller crate engine

    Part number 12677167 or part number 19367080. This is a new GM crate engine that must have come out recently. Most of the vendors show it for about $3300 if you search for the parts number, but I've had trouble finding it when I just search for GM crate engines...
  12. 75gmck25

    Seal between Master cylinder and brake booster

    I am replacing the master cylinder on my 1975 GMC pickup, and when I pulled off the master cylinder I found a round rubber "cup" seal between the master cylinder and the power brake booster. The rubber seal is partially broken and the rest of the rubber is in bad shape, so I want to replace...
  13. 75gmck25

    Size of stock center dash speaker in '75 truck

    I would like to replace the center dash speaker with one of those with two stereo channels. In my '75 there are no other cutouts for speaker in the top of the dash (later years they added a speaker cutout on each side). Classic Car Stereo lists the stock speaker as 4"x10", but when I tried...

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