As we reported previously, the all-new 2020 Chevrolet Silverado HD and 2020 GMC Sierra HD brought a new gasoline engine option into the fold, namely the 6.6L L8T V8, which arrived as a replacement for the outgoing 6.0L L96 V8. Then, earlier this month, Chevrolet Commercial announced it would offer the 6.6L L8T with the 2021 model year for the Chevrolet Low Cab Forward Truck. Nevertheless, the engine is still conspicuously absent from the one truck which arguably needs it the most – the Chevrolet Silverado Medium Duty line. The question is, why? Well, it’s possible that it all comes down to the transmission.
Up until now, the 6.6L L8T V8 has exclusively paired with the MYD 6L90 six-speed automatic transmission, which is limited to a 15,000-pound GVW, or 21,000-pound GCW. And while specs like that are perfectly adequate for the Chevrolet Silverado 3500HD chassis cab, GMC Sierra 3500HD chassis cab, or 3500/4500HD Low Cab Forward truck, they simply wouldn’t be up to task with the Chevrolet Silverado Medium Duty truck line.
That said, it’s possible that General Motors is currently waiting to launch the 6.6L L8T on the Chevrolet Silverado Medium Duty truck line in order to develop a new transmission that’s more robust than the current MYD 6L90 six-speed automatic. Something like an Allison 1000 or 2000 would certainly do the job nicely.
To note, the 6.6L L8T V8 gas engine produces 350 horsepower and 425 pound-feet of torque when equipped in the Chevrolet Low Cab Forward truck. Found under the hood of the 2020 Chevrolet Silverado HD and 2020 GMC Sierra HD, the ‘eight produces 401 horsepower and 464 pound-feet of torque, an increase of 41 horses and 84 pound-feet when compared to the outgoing 6.0L L96 V8.
Would you like to see the 6.6L L8T V8 gas engine in the Chevrolet Silverado Medium Duty truck line? Let us know your thoughts in the comments, and make sure to subscribe to GM Authority for more Chevrolet Silverado news, Chevrolet news, and around-the-clock GM news coverage.