Published On: Sun, Jun 12th, 2016

Holy Shift! A Look inside GM’s new 10-Speed Automatic

The 2017 Camaro ZL1 is poised to challenge the most advanced sports coupes in the world in any measure – with unprecedented levels of technology, refinement, track capability and straight-line acceleration. A cohesive suite of performance technologies tailors ZL1’s performance, featuring an updated Magnetic Ride suspension, Performance Traction Management, electronic limited-slip differential, Custom Launch Control and Driver Mode Selector.

DETROIT Engineers for the new 10-speed automatic transmission available in the 2017 Chevrolet Camaro ZL1 built on the experience of previous, critically acclaimed Hydra-Matic multispeed transmissions to push its performance, refinement and efficiency advantages to a new threshold.

The 10-speed is an all-new design – and the first-ever application in a car – with a wider, 7.39 overall gear ratio spread, that enables the ZL1’s supercharged engine to remain at optimal engine speeds during upshifts.

“With world-class shift times on par with the world’s best dual-clutch transmissions and the refinement that comes only from a true automatic, the 10-speed delivers incomparable performance on and off the track,” said Dan Nicholson, vice-president, GM Global Propulsion Systems. “It also leverages the experience of our other multispeed transmissions to deliver that performance with greater efficiency as its use expands into other vehicles.”

The wider overall ratio enables a lower numerical top gear ratio – an attribute that reduces engine speed on the highway, which contributes to greater fuel efficiency than a comparable eight-speed transmission. Improvements in spin loss complement the optimized gearing, further enhancing efficiency.

And while the Camaro ZL1 will be the first GM vehicle to offer the new 10-speed automatic, designed for rear-wheel-drive applications, it will be available in eight additional vehicles by 2018.

GM Hydra-Matic 10-speed vs. eight-speed gear ratios

Type: 10-speed automatic eight-speed automatic
Gear ratios (:1)
     First: 4.70 4.56
     Second: 2.99 2.97
     Third: 2.15 2.08
     Fourth: 1.80 1.69
     Fifth: 1.52 1.27
     Sixth: 1.28 1.00
     Seventh: 1.00 0.85
     Eighth: 0.85 0.65
     Ninth: 0.69
     Tenth: 0.64
     Reverse: 4.87 3.82

Source & Image Credit: General Motots

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