Exclusive: Half-ton Trucks to Get New Eight-Speed Automatic Transmission

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Thread: Exclusive: Half-ton Trucks to Get New Eight-Speed Automatic Transmission

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    Exclusive: Half-ton Trucks to Get New Eight-Speed Automatic Transmission

    Silverado and Sierra to gain two extra gears
    www.gminsidenews.com
    July 11, 2014
    By: Mark Bono


    Rumors have been swirling around about GM's half-ton trucks gaining an eight-speed automatic transmission for the 2015 model year. We were let down after the release of the 2015 Order Guide for the Silverado and Sierra did not contain any mention of them gaining GM's new eight-speed automatic. We naturally thought the full-size twins will be soldiering on for another year with the six-speed automatic transmission.

    Today though we have received two pictures from an anonymous source confirming that the 2015 full-size trucks will be getting the new eight-speed transmission with a catch..... Just like when GM transitioned from the four-speed automatic to the six-speed automatic back in 2008, the top engine will the only one gaining the new transmission. The 4.3 liter V-6 and 5.3 liter V-8 will soldier on with the six-speed automatic while the 6.2 liter V-8 will be paired with the new eight-speed transmission.

    GM offers the 6.2-liter V-8 in Double and Crew Cab half-tons with the max trailering package, Silverado High Country and Sierra Denali. In all half-ton applicaitons the engine generates 420 horsepower and 460 foot-pounds of torque.

    The new eight speed is apparently the 8L90, which recently debuted in the 2015 Corvette Z06 and will be offered in the 2015 Corvette Stingray as well. The EcoTec3 6.2 liter V-8 in the half-tons is a derivative of the 6.2-liter V-8 that powers the Corvette Stingray. Although no details are known, we can likely expect incremental increases in both performance and fuel economy thanks to the two new cogs.






    Last edited by nsap; 07-12-2014 at 02:12 PM.

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    Re: Exclusive: Half-ton Trucks to Get New Eight-Speed Automatic Transmission

    (yawn) Would rather see an 8 speed MANUAL
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    Re: Exclusive: Half-ton Trucks to Get New Eight-Speed Automatic Transmission

    Is there a logical reason behind this only being available on the 6.2? Or is it just GM being GM?

    Regardless, its good to see. Hopefully the rumored refresh is part of the package, even though the looks of the new trucks has grown on me significantly.
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    Re: Exclusive: Half-ton Trucks to Get New Eight-Speed Automatic Transmission

    Wish I was the source lol...This explains the 3.23 and 3.42 gears w/the 6.2. Max tow gets the 3.42, regular 6.2 gets the 3.23.

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    Re: Exclusive: Half-ton Trucks to Get New Eight-Speed Automatic Transmission

    Meanwhile at Ram...

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    Re: Exclusive: Half-ton Trucks to Get New Eight-Speed Automatic Transmission

    I guess that explains why the 6.2 isn't immediately available on the 2015's.
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    Re: Exclusive: Half-ton Trucks to Get New Eight-Speed Automatic Transmission

    Will the Yukon Denali and Escalade also get the 8 speed as they both have the 6.2 engine?

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    Re: Exclusive: Half-ton Trucks to Get New Eight-Speed Automatic Transmission

    Probably just being causes, they still don't have a lot of real world data on it yet. Nothing would kill a truck faster then a crappy trans. It will probably be standard across the line next model year.

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    Re: Exclusive: Half-ton Trucks to Get New Eight-Speed Automatic Transmission

    It's about time!

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    Re: Exclusive: Half-ton Trucks to Get New Eight-Speed Automatic Transmission

    My guess is, the reason it will only come out with the 6.2, is availability. And it will most likely go with the Escalade and Yukon Denali first, then Sierra Denali (maybe the SLT 6.2 too?).
    Don't fret gear lovers, because I had the first 6sp in a '07 SD w/6.2, and it really sucked. I mean really sucked, as in "dealer, please take this thing back" sucked. Three dealer computer updates later (over 1-2 years), it was driveable, but still sucked. So GM knew it sucked. My '11 was much better, but I still didn't like it. The new '14 6.2 6sp finally works great, and I have zero desire to be the first 8sp owner after my experience.

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    Re: Exclusive: Half-ton Trucks to Get New Eight-Speed Automatic Transmission

    It's a little late but it is welcomed..The question will be how much gain in engine efficiency will this gain in terms of MPG ??? Hope to see this in other GM vehicles very soon.

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    Re: Exclusive: Half-ton Trucks to Get New Eight-Speed Automatic Transmission

    6 cogs is a lot.. and the 6th is usually highway cruising, In my traverse (AWD) and Equinox (AWD) the vehicles can keep 80 MPH on a flat road below 2000 RPM.. I know its not apples to apples but, I suspect with the Vortec torque, the 6 speed is similar in tuning and ratios.

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    Re: Exclusive: Half-ton Trucks to Get New Eight-Speed Automatic Transmission

    Quote Originally Posted by DealerGuyAtl View Post
    Will the Yukon Denali and Escalade also get the 8 speed as they both have the 6.2 engine?
    ^^ This.

    Also, very dissapointed that the 8 speed is only on the top spec trucks. I want to think that it's a volume restraint and not a cost related one.
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    Re: Exclusive: Half-ton Trucks to Get New Eight-Speed Automatic Transmission

    I assume this is due to the other engines getting the Ford/GM joint venture 10 speed (I assume for 16). If that's less than a year away I can see not wanting to spend money to develop the 8 speed. Where the 8 speed 6.2L's already developed for other applications.

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    Re: Exclusive: Half-ton Trucks to Get New Eight-Speed Automatic Transmission

    Quote Originally Posted by ZR2BlaZeR2 View Post
    Is there a logical reason behind this only being available on the 6.2? Or is it just GM being GM?

    Regardless, its good to see. Hopefully the rumored refresh is part of the package, even though the looks of the new trucks has grown on me significantly.
    The logical reason is likely how much closer the calibrations are to the ones used in the lt4. I would bet we will see them for the others by next model year

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