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  1. S

    Another Oil Pressure Question

    I read through the threads and didn't see this issue. 85 with 350. Have the dual oil pressure sensors. I swapped the motor/trans/body from a 2500 frame to a SWB 1500 frame. Oil pressure gauge worked prior. We fired up the motor after the swap and the gauge is all over the place. It jumps from...
  2. S

    I need a donut

    I have a 1985 350/400 out of a 2500 GMC. Running the stock exhaust manifolds with the A.I.R deleted. Also using the stock down pipes as the ole 2500 came factory with true duals. Like a dummy, I pitched the old donut exhaust gaskets on tear down and now I have no idea what size I need to put it...
  3. S

    85 GMC Engine Wiring Questions

    I bought an 85 GMC C25 and am in the process of swapping it all over to a SWB C15 frame. Truck has a 350 "M" with THM400 all original. Questions I have on engine wiring. 1. I found four wires close to the alternator that were previously cut. The look pink/black x2 and 2 solid black wires...
  4. S

    Dash Differences?

    I recently purchased an 85 GMC. I'm coming over from the 76-72 trucks, but grew up in Squares. The dash of this truck has the check engine light in the center between the mph/fuel gauges. I thought this was only an option for diesel trucks, but I guess not. I don't see this dash replacement...

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