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2015 Silverado & Sierra to get 8-speed transmission


Zane
  • By Zane Merva

    Executive Editor, GM-Trucks.com

    7/18/2014

    General Motors has confirmed that every 2015 full-size truck and suv equipped with the 6.2L EcoTec3 engine will be offered with a brand new GM developed 8-speed transmission.

    This includes the Chevrolet Silverado, Suburban, Tahoe and GMC Sierra, Yukon, and YukonXL.

     

    The new Hydra-Matic 8L90 eight-speed is similar in size to the outgoing 6-speed and will allow lower rear axle ratios for improved fuel economy.

     

    Fuel economy and additional specifications for 8-speed equipped vehicles will be announced later this year.

-----------------------

2015 Chevrolet and GMC Pickups, SUVs to Offer Eight-Speed Transmission

DETROIT – Chevrolet and GMC have confirmed a new eight-speed automatic transmission will be standard on 2015 Chevrolet Silverado, GMC Sierra and GMC Yukon Denali/Yukon XL Denali models equipped with the 6.2L EcoTec3 V-8.

The GM-developed Hydra-Matic 8L90 eight-speed is approximately the same size and weight as the Hydra-Matic 6L80 six-speed automatic. Its 7.0 overall gear ratio spread is wider than GM’s six-speed automatic transmissions, providing a numerically higher first gear ratio to help drivers start off more confidently with a heavy load or when trailering. The 8L90 also enables numerically lower rear axle ratios, which reduce engine rpm on the highway.

With 420 horsepower and 460 lb.-ft. of torque, the 6.2L EcoTec3 V-8 is the most powerful engine offered in any light-duty pickup, and offers a maximum available trailer rating of 12,000 pounds, based on SAE J2807 Recommended Practices. As with other EcoTec3 engines, it seamlessly switches to four-cylinder operation under lighter loads to improve fuel economy.

Additional technical details and the EPA estimated fuel economy will be announced closer to the start of production in the fourth quarter of 2014.


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Recommended Comments



2doorpost

Posted (edited)

The 6 speed in mine is a slushbucket of surprises.

 

Why don't they get that one right, then worry about throwing in two more gears?

Edited by 2doorpost
glamis44

Posted

 

I'd like to see you manage an automobile production...

 

If you call this "Managing" Then Yes, I can do a much better job for sure.......

 

GM needs to start fresh from the top down.............

 

If I do pick up my Denali, it will probably be my last GM vehicle based on how they handled this and my order. And yes, I have purchased tons of them.

  • Like 1
2014Z71LTZ

Posted

I heard a rumor last fall that it was coming out, also heard that GM worked with Dodge on this along with the turbo diesel V6 that Dodge currently offers.

Tahoe02

Posted

I call B.S. on this and a few other option changes. As i read the first post it states GM will offer the 8 speed for all 2015 full size Trucks and SUVs with the 6.2. I believe some have already been delivered without the 8 speed and some have been ordered without the 8 speed. Remember the first post said all 2015s. Also those of us who stepped up to the plate early on and paid around 60,000-70,000 are missing out on the now being released foot sweep tail gate opener and 4G hot spot Wi-Fi and as I understand a couple of other options down the product line.Doesn't say much for GM and as the post stated GM needs to get their heads out.

ptwat

Posted

I have a 2009 Tahoe LTX and went to look at the new ones. The price took my breath away (and the new body looks like a bus to me). I don't think an 8-speed is going to bring me to the fold anytime soon.

shortnugly

Posted (edited)

The 6 speed in mine is a slushbucket of surprises.

 

 

LOL!! THAT was funny.

 

Just ditched the 3:42 in my '12 5.3 for a set of 4:56. Truck couldn't get out of it's own way.

 

3:08's ?? I don't think the 6.2 could overcome that.

 

Sheesh

 

Edited by shortnugly
glamis44

Posted

Here is the real point.

 

GM knew when the 8 speeds were going to be available, as I have read about them in the works for a while. Why not wait to release the 2015's with the 6.2 to accommodate ALL of these new features and present a total package? To add features as a 2015.5 mid year change is ludicrous.

 

It was a half ass roll out of their high end vehicles (Escalades & Denali's). For them to even put the 6 speed in some, but not all, shows their lack of planning and forethought. For those that already bought one, or ordered one, and to now have an "outdated" model is ridiculous.

 

And the ridiculous prices not help their case either.

Kent2500

Posted

"To add features as a 2015.5 mid year change is ludicrous."

 

The 2000 Tahoe was a split year. There is the 2000 Tahoe "old style" (ie, 1999-) and the 2000 Tahoe "new style" (ie, 2001+). So mid year updates is nothing new. (btw, I have the 2000 "old-style" Tahoe Z71 and been very happy with it.)

 

 

 

 

Daryl LBZ

Posted

It was a half ass roll out of their high end vehicles (Escalades & Denali's). For them to even put the 6 speed in some, but not all, shows their lack of planning and forethought. For those that already bought one, or ordered one, and to now have an "outdated" model is ridiculous.

 

And the ridiculous prices not help their case either.

 

 

The way they rolled out these trucks to begin with was just weird and goofy.

  • Like 1
glamis44

Posted

"To add features as a 2015.5 mid year change is ludicrous."

 

The 2000 Tahoe was a split year. There is the 2000 Tahoe "old style" (ie, 1999-) and the 2000 Tahoe "new style" (ie, 2001+). So mid year updates is nothing new. (btw, I have the 2000 "old-style" Tahoe Z71 and been very happy with it.)

 

 

 

 

 

That's not the same. In that case the 2015 would be the old body and the 2015.5 would be the new body and properly released.

KARNUT

Posted

WOW, this is amazing, Ive never had a bad experience with GM yet and I had a few. Cant wait to try out the new stuff in a few years when I trade. The differents between this one and the last new GM truck ( 07 Avalanche ) is night and day. Had a Dodge in between not impressed. Hope I stay lucky.

Daryl LBZ

Posted

WOW, this is amazing, Ive never had a bad experience with GM yet and I had a few. Cant wait to try out the new stuff in a few years when I trade. The differents between this one and the last new GM truck ( 07 Avalanche ) is night and day. Had a Dodge in between not impressed. Hope I stay lucky.

 

 

Their usually pretty good trucks. I've had 5 different ones total, and even the ones with a lot of miles on them weren't bad trucks. Worst ones I've had were the 1988, and the 2009. The 88 was expected though as it was worn out when it was given to me, but the 09 wasn't a very good truck for being bought brand new. Still not bad trucks at all from GM.

KARNUT

Posted

Their usually pretty good trucks. I've had 5 different ones total, and even the ones with a lot of miles on them weren't bad trucks. Worst ones I've had were the 1988, and the 2009. The 88 was expected though as it was worn out when it was given to me, but the 09 wasn't a very good truck for being bought brand new. Still not bad trucks at all from GM.

Some of the guys that work in my shop like to buy older Tahoes or Suburbans, people ten to take care of them, unlike pickups here in Texas. You can get them at reasonable price and they tend to go up to 300k without to much trouble.
gonzoid

Posted

12k tow rating with a 3.08 gear? I cant believe they would do it.seems it would burn up the rearend dam quick

InertiaFaze

Posted

As announced, look for a mid-2015 introduction of the 8 Spd and it will be paired with 6.2L engine only. This was not a joint venture with any other manufacturer.




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