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#3460847 - 08/20/14 10:43 PM New GM 8 speed transmission to use new Syn fluid
Nate1979 Offline


Registered: 04/08/13
Posts: 729
Loc: Portland, OR
I couldn't find any details about the new fluid except a few of the articles make mention of a new synthetic fluid in the new 8l90 GM transmission:
http://www.offroadxtreme.com/news/detail...-silverado-1500

I wonder if there will be a new Dexron spec?
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#3460917 - 08/21/14 02:47 AM Re: New GM 8 speed transmission to use new Syn fluid [Re: Nate1979]
OneEyeJack Offline


Registered: 09/14/10
Posts: 1793
Loc: S California
New spec, new license fee. What's not to like about that for GM? People here that really beat the old 6 speed in off road and trailer towing like Red Line D6 in the transmission and transfer case.
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#3461031 - 08/21/14 08:02 AM Re: New GM 8 speed transmission to use new Syn fluid [Re: Nate1979]
bigt61 Offline


Registered: 02/12/13
Posts: 1346
Loc: Virginia
Transmission technology is incredible right now. I hope the durability is there.
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#3461038 - 08/21/14 08:07 AM Re: New GM 8 speed transmission to use new Syn fluid [Re: Nate1979]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 15432
Loc: Sunny Florida
Yep, and rated for over 750 foot pounds of torque!

Faster shifts than a Porsche DCT.

With the proliferation of torque converter equipped DCT's in Acura, Benz, and others this means the slush box is not dead...
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#3461092 - 08/21/14 09:26 AM Re: New GM 8 speed transmission to use new Syn fluid [Re: Nate1979]
Greasymechtech Offline


Registered: 07/11/14
Posts: 481
Loc: Paradise of Florida
So, Dexclown-6 wasn't good enough? Waiting on Dexron7!

We'll just have to be happy with synthetic Dexron-6HP.

I just hope that its backwards compatible, as an upgrade to DexronIII and Dexprofit-6.
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#3461228 - 08/21/14 12:01 PM Re: New GM 8 speed transmission to use new Syn fluid [Re: Nate1979]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 15432
Loc: Sunny Florida
Why the hard feelings? By almost any measure of effectiveness Dex VI is leagues better than previous versions.

Please explain without the hyperbole...
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"In a democracy, dissent is an act of faith."
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Best ET-12.79 @ 111 mph
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Just like we go to Publix

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#3462270 - 08/22/14 11:33 AM Re: New GM 8 speed transmission to use new Syn fluid [Re: Nate1979]
MolaKule Offline


Registered: 06/05/02
Posts: 14786
Loc: Iowegia
I predict the new full synthetic ATF will have a 100C viscosity spec in the 4.X cSt range, a 40C viscosity of 18-20 cSt, and a Brookfield viscosity of 7,500 cP.


Edited by MolaKule (08/22/14 11:36 AM)
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#3462596 - 08/22/14 07:13 PM Re: New GM 8 speed transmission to use new Syn fluid [Re: SteveSRT8]
dailydriver Offline


Registered: 03/14/06
Posts: 7226
Loc: Bucks County, Pa.
Originally Posted By: SteveSRT8
Yep, and rated for over 750 foot pounds of torque!

Faster shifts than a Porsche DCT.


Is a variant of this new slushbox what the automatic Z06es are going to get? shrug
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