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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: 1679
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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2012 Chevy Silverado 5.3L 4x4 PP 5w-30 w/ Fram Ultra
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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: 3684
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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84 Honda Civic wagon 5-speed, 440K+ Red Line 0w-30, Red Line MTL
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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: 1850
Loc: Virginia
Transmission technology is incredible right now. I hope the durability is there.
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92 Suburban 2500 7.4L 58k M1_5w30 5yr OCI
99 Olds Aurora 4.0L 91K M1_5w30 5yr OCI
13 Dodge Dart 2.0L 29k PP 0w20 OLM OCI
70 Camaro 5.7L 59k

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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: 16689
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: 1053
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: 16689
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...
_________________________
"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
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: 15887
Loc: Iowegia - USA
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: 7836
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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Red Line 0W-40/Sustina 0W-20 (20/80 mix)
Fram Ultra filter
Amsoil SVO 75W-140/3.8 oz. XL-3
Red Line D4 in the T56

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