GM pickups like the 2015 GMC Sierra 3500 boast strong engineering that ... power to the rear wheels is a bulletproof Allison 1000 six-speed automatic transmission. The Allison transmission ...

we now have news for the GMC Sierra 2500/3500 pickups. The brand has unveiled its refreshed 2024 models, which feature some mild styling updates, new interiors, upgraded engine power, a host of ...

GMC's huge Twin Six V12 gas engine was made to take on its diesel counterparts, powering fire trucks and farm machines, but ...