When we heard famous EFILive tuner “Idaho” Rob Coddens had a 500-rwhp, LML-powered 2013 GMC Sierra he was playing around with that still had all its emissions hardware intact, we just had to see for ourselves.Although newer diesel trucks are far more complex than older models, they also have advantages over their older counterparts. When we heard famous EFILive tuner “Idaho” Rob Coddens had a 500-rwhp, LML-powered 2013 GMC Sierra he was playing around with that still had all its emissions hardware intact, we just had to see for ourselves. Unfortunately, the transmission hadn’t been upgraded for the extra power, so it was starting to check out.

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Photo Gallery: 2013 GMC Sierra 500hp LML Allison 1000 Transmission Upgrade



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