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    Sierra Foothills
  • Drives
    Stock 66 Chevy K10 SCLB, 03 GMC K2500HD CCSB SLE

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David89GMC's Achievements


Enthusiast (3/11)



  1. Bad gas? If so, the computer might adapt and the shuttering may stop.
  2. Get the 2000 GMT800 Body Builder's Manual. It should be available online and tell you if it was a factory option. I can say they don't show a CCSB 1 ton dooley in the 2002 BBM.
  3. Look online for the pdf of the "Body Builder's Manual" for your model and year. It should be a GMT800. Sorry, but it's too big to upload.
  4. Why did you put 2011 parts in a 2002 vehicle? Did you replace everything in the power steering and hydroboost 2002 with 2011 parts? Newer doesn't mean upgrade, it most likely means incorrect. Even in 2002 there are several different power steering pumps, with different connections. I did my '03 2500HD and had to learn this before ordering a new pump. Hate to say it, but get the correct parts for your vehicle and try again. Or ask Blue Top to help with the problem. Even their website shows very different steering gear models between the "2011 upgrade" and your model year.
  5. Good information from CamGTP, the 6.0 is what we used to call "detuned". Just getting a hotter tune may be all you need. Keep in mind that the LY6 has variable valve timing, so you might look more closely at modifications for that.
  6. My crew cab is a real blessing. There's a huge amount of space in the rear area when the seats are folded down. I have two large dogs, so I got a large piece of carpet from Home Depot that goes from the front headrests to the rear window and they're happy as can be. For a work truck, either rear seat can be folded and valuables stored there. The crew cab short bed (6.5 ft, CCSB) is actually longer than a standard cab long bed (SCLB). This makes the CCSB a great platform for towing, my '03 CCSB 2500HS 6.0 4x4 has a gooseneck hitch in the bed.
  7. An AllData subscription would be a good start. eTrailer might be a good source as well.
  8. Why do you want to do this? I see the advantages of the gmt900 over the gmt800, but it's not at all practical. See CamGTPs response. For example: If you have a wrecked 2014 with a good drivetrain, get another GMT900 with a bad drivetrain and put the two together.
  9. Google is just not trustworthy. CamGTP showed you the owner's manual data, so go with that. I have an '03 GMC 2500HD 6.0 4l80e and wouldn't consider towing more than 8000 lbs. My trailer is 7000 lbs fully loaded and the truck bed is full of stuff. The truck labors a bit, even in Tow mode, but at least I'm safely within the truck and trailer's limits. You need a 1 ton diesel duelly to pull that 15K trailer safely. Sell what you have and get a used 24 valve Dodge duelly.
  10. Of course the harnesses could be the problem. Get the correct harnesses. Thanks for typing out the problem. Nobody opens unknown attachments anymore.
  11. DVD players need to be connected to ground in order to play when the engine is running. That toggle switch might have been used to enable a DVD video to play while driving. Other than that, there's no way for us to know what the previous owner thought they were doing.
  12. Wow, 5mpg? Could the brakes on your trailer be sticking? Or is the brake controller not working correctly? Are you using Towing Mode? If so, you've probably noticed the increased rpm before shifts, and harder shifts. The higher rpm will reduce mileage. Does your 2500 have a 4L80E or the 4L60E? BTW: my '03 K2500HD 6.0 4L80E 4.10 gets about 10 mpg empty.
  13. Most "cold air intake" setups put the filter on a short hose to the throttle body. This ain't good. Unless you isolate the filter from the engine bay, you're just installing a Hot Air Intake.
  14. Did you clean the tires of all debris and check them for roundness? I often get what you describe and it's always a rock stuck in the tread, front or rear. Radial ply tires can fail with this symptom. A clunk on each revolution indicates a wheel or axle related problem. The propeller shaft turns 4 times the speed of the wheels and final drive, so you can disregard that as a source. Since this is a dually, I'd suspect the rear differential. After 16 years of towing and hauling it's not unusual for the rear end to go bad.
  15. Check out the online ALLDATA manuals. There are $15 per year deals, but the basic subscription is $20. I found it to be far better than Chiltons, and it's model-specific. So, you can get a 2006 GMC 3500 manual and see the differences before spending the big bucks for the set of paper or DVD manuals.
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