Ordered a Sierra SLT, Premium Plus package, X31 6.2 on 11/2, still event code 1100. My dealer has an allocation of 10 orders per month and due to constants only one can be ordered with the 6.2. The good news is my truck will be the next 6.2. Mine is a 1500, didn't realize this was a 2500 post.
Not an expert but The K in front of the number used to mean 4 wheel drive. Another thing to keep in mind is1999 was a transition year for the new GMT 800 platform as well as still producing the prior GMT 400. So there were Two body styles in 99. Hope that helps.
On my 2008 Sierra when I removed the OnStar module and drove the truck it threw codes, Service four wheel drive, ABS light and engine light. When I reinstalled it the codes reset and went away. Not sure if there's a work around with tech2, but I kind doubt it. Maybe you can try relocating it?
The X31 package is $850 for the Sierra which includes Hill descent control, Skid Plates, High Capacity Air filter and X31 badging, wonder what the badging is? Also included 2 speed transfer, p265/65 15 All terrain tires and Dual exhaust!... Interesting
I will be curious to see if the K47 High Capacity Air Filter will be interchangeable with the standard filter as in years prior, or if the air box is different now on the 19s. Looks like the only way to get the K47 option is with the X31 off-road or VYU Snow Plow Prep package.
My 2008 5.3 had been using about a half quart every 3000 miles. Since it wasn't leaking or burning any oil I targeted the AFM by doing two things, I installed a updated drivers side valve cover and had the AFM turned off in my Black Bear Performance tune. It now uses zero oil. I cant say if it was the valve cover or AFM or combination of the two that was causing the usage.
Your options are to disable AFM and to leave it in 8 cylinder mod with the range unit mentioned above or a custom tune. If your talking about wanting delete it entirely the kit with all the hardware starts about $400 and involves tearing down the top end of the engine.
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