Chev’s new 10-speed box

The Witness - Wheels - - MOTORING -

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 with a wider, 7,39 over­all gear ra­tio spread, that en­ables the ZL1’s su­per­charged en­gine to re­main at op­ti­mal en­gine speeds dur­ing up­shifts.

New ul­tra-low vis­cos­ity trans­mis­sion fluid also re­duces fric­tion, while an in­ter­nal ther­mal by­pass al­lows the trans­mis­sion to warm up faster – at­tributes that en­hance fuel ef­fi­ciency

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 op­ti­mised 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.

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