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6.4L 392 with 8HP70 Auto Transmission. - 5.7L 345 with 8HP70 Auto Transmission. Fully unlocked GPEC2A PCM for tuning. This is the correct unlock needed for the GPEC2A to be tuned. I can also duplicate your existing pcm without modifying it so that this pcm can be used as a spare.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.