ryank1 replied to BigPig's topic in 1999-2013 Silverado & Sierra 1500The sensors for the 2004 are different than the 2018 and will not work with your truck
Sounds like you have a wheel speed sensor starting to fail. You really need a scanner that shows individual wheel speeds and you will see at low speeds one of the sensors is dropping out and reading 0 mph, causing the ABS to think that the wheel is locked up and activating the ABS. It could also be the steering wheel position sensor failing, but speed sensor is more common for feeling the ABS activating. Either way you need a better scanner to either read wheel speeds or C codes. The scanner that the auto parts stores use for free can only read P codes and ABS and Stablilitrak codes are C or Chassis codes.
There is a lot of information in these 2 links. I am pretty sure the 6.2 was first found in the 2007 Denali and Escalade only. All of the 2500 series trucks had the 6.0 as their base engine and the 6.2 was only found in the 1500 series trucks as an option. The 6.0 was pretty much the same as in term of reliability. With all engine swaps, try to avoid AFM unless you want to spend money to do away with it. As far as simplicity the 6.0 is pretty basic, but some of the 6.2 had AFM and VVT. https://en.wikipedia.org/wiki/LS_based_GM_small-block_engine http://gmauthority.com/blog/gm/gm-engines/
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