Assuming you really want to push on with the project, the next company to contact is Art Morrison Enterprises, www.artmorrison.com, (800) 929-7188. AME is well known for its drag racing, street machine, and truck chassis and suspension components. AME offers a wide array of chassis/suspension items, all the way from individual components to subframe kits to complete chassis. The company's Air Spring Plus Frames are CAD-engineered to specific applications.
AME has a line of Classic Truck Frames for '50s and '60s 1/2-ton pickups. These frames are designed for trucks and feature 2x6-inch main 'rails and 2x4-inch front and rear subframes. AME may be able to custom-build a frame for your application. A custom frame would eliminate the restrictions of your stock frame, so going low wouldn't be a problem, outside of the related clearance problems involved in laying frame.
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I have a couple technical questions about my '93 GMC pickup. My truck is a base-model V-6 standard cab shortbed with few options. When I bought it, the air conditioner was dead, and when I had it fixed, it was converted to R-134.
Last year, I started noticing some odd behavior from the air conditioning. After using the A/C for a while, the airflow output drops to almost nothing. The fan speeds don't change; rather, something is blocking the airflow. If I turn the system off completely for a few minutes, when I turn it back on, normal airflow is restored for a bit and then the cycle repeats. This isn't much fun during Texas summers.
I suspect that something's letting one of more of the diverter doors move into the wrong position, but I have no idea where to start looking and neither the Chilton's or Haynes manuals that I have are any help. Could you offer some suggestions where I can start looking to fix this problem?
Second question: Due to some physical problems, it's awkward for me to operate the manual windows. How difficult would it be to convert the windows-at least, the driver-side window-to power operation, using either OEM parts or one of the aftermarket kits? I appreciate any suggestions and look forward to the how-tos that you publish in Sport Truck.
We agree with you that your air-conditioning problem is probably related to a malfunctioning diverter door. Given the age of your truck and your description of the problem, we'd suspect a faulty vacuum line. You need to trace the vacuum source from the engine through the firewall to the dash. A cracked or split hose anywhere along the line could cause your problem. Inspect where any hoses connect to a distribution port. The vacuum line you're seeking should run from the back of the engine to the heater box.
It's also possible that there could be a problem with the control valve that changes things from heat to blend to A/C modes.
Installing power windows, especially just the driver-side door, can be pretty easily accomplished with an aftermarket kit. The main downside to some kits is that they protrude from the door panel.
If you live near one of those pick-your-own-parts wrecking yards, you can get an entire dented door from an '88-'98 Chevy/GMC pickup. With the whole door at your disposal, it's a simple matter of swapping manual parts for power ones. If you were lucky, you could use the interior door panel from the donor door. Even if it's the wrong color, you may be able to dye it to match your interior.