There was plenty of excitement to go around when we found out that GM’s new 8-speed 8L45 automatic transmission will do shifting duty in the 2017 Chevy Colorado and GMC Canyon. Unfortunately, the 8-speed is not an across-the-board affair, since it is only mated to the midsize trucks’ two gasoline engines. Instead, the six-speed automatic 6L50 will continue shifting the gears in Diesel-powered 2017 model year Colorados and Canyons.
The reason for this turn of events appears to be quite simple, as GM has yet to configure and validate its new 8-speed for use with the 2.8L Duramax LWN four-banger, which brings us to the question of when that will take place.
At this time, there is nothing official about when the 8-speed will be joined with the Colorado Diesel or Canyon Diesel, but here’s to hoping that it will be sooner rather than later… such as for the 2018 model year.
Chevrolet Colorado information