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    LS exhaust manifold repair bracket, can only find one side

    I have rear exhaust manifold bolts broke on each side of my 6.0 LS motor. I can find Dorman 917-107 (and other manufacturers) for front right/rear left but I cannot find the opposite side anywhere online. I'm trying to order one of each as enticement to get my mechanic to try to replace the...
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    How to ID which A/C compressor

    Hi, this isn't exactly GMT400 but this is my fav truck forum with lots of experienced/informed members. I have a 2001 GMC Sierra 2500 with 6.0 gas motor. The A/C compressor took a dump and when I look it up I find two different units listed. One is H6 or HU6 and the other is 10S17F. Is there an...
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    Need stock ECM for 99 K3500

    I know that replacing the ECM with the 411/LS ECM is popular on here so I wanted to see if anyone has a stock ECM that fits the 99 model year lying around that I can buy or (preferably) borrow to test in my truck. If it turns out to be the problem I'd gladly buy it, if not I could return it...
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    PRNDL & 4WD fuses blowing, went into limp mode. Any ideas?

    99 K3500 CC LB 7.4L. I was driving this morning in heavy rain, running 55-60, when suddenly it acted like it went into passing gear. I lifted the throttle a bit but it never shifted back. I noticed the tach, speedo and gear selector indicator light all stopped working. I stopped and checked...
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    Dual battery issues

    My 99 K3500 came with dual batteries. It had a few wiring problems (loose terminals, blown trailer brake controller, trailer plug full of mud) all of which I have fixed. After fixing those issues it began draining the batteries so I disconnected the aux battery and under-hood light and the...
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    AC Delco or Standard Motor Products ignition parts?

    I'm going to do a complete tuneup on my 99 K3500 7.4L and was wondering what brand to go with. I'm going to use AC Delco double platinum plugs plus wires, cap, rotor and coil. My local auto parts store said their SMP ignition products were better than AC Delco (of course) but thought I'd ask as...
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    99 K3500 7.4 missing under load

    Hello, new member first post. I have a 99 K3500 crew cab dually with the 7.4 Vortec and 4:56 gears. It only has 88000 miles but was obviously worked hard as a farm truck. It runs good but when towing a heavy trailer I am getting a dead miss/cutting out. I just had a new Carter fuel pump & fuel...

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