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bmanning's avatar
bmanning
Explorer
Aug 20, 2013

Surprising discovery: 5-speed vs 6-speed automatic

As some of you know from other threads I am trying to help my FIL find a Sequoia for grand kid duty. In doing general research I looked into the ratios of the 2005+ 5-speed (behind the 4.7) vs the ...
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BenK's avatar
BenK
Explorer
Aug 21, 2013
The other thing with these higher numbers of gears is that the OEMs now tune
the ICE's (both gasser and diesel) for max efficiency and SMOG cleanness in
so these automatics will try to keep within those optimal RPM range

Couldn't do that as easily before with the long legged gearing. Close ratio now
allows them to keep the ICE within a much narrower RPM range...and...tune for that

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