GM 8L45 8 speed transmission

SuperSound · 03-20-2015, 04:34 PM

Some more info on the possible transmission for the V6 Camaros.

Along with debuting a new engine family for the upcoming luxury sedan, Cadillac today rolled out a new 8L45 eight-speed automatic transmission to debut in the 2016 CT6 later this month. The new eight-speed paddle shift transmission will also become available in the mid-size CTS and compact ATS for the 2016 model year, the automaker announced.

The 8L45 transmission, based on the same eight-speed transmission family as the 8L90 introduced in the 2015 Corvette Z06, will be available on 3.6-liter versions of the CT6, on 2.0- and 3.6-liter versions of the CTS and on 2.0-, 2.5- and 3.6-liter versions of ATS. The transmission has been scaled to match the performance on offer from less powerful engines, with the 8L90 serving in high horsepower and high torque applications like the ATS-V, CTS-V and twin-turbo CT6.
Like the 8L90, the 8L45 occupies the same space as GM’s previous six-speed while weighing less. The 8L45 is actually a bit smaller and approximately 33 pounds lighter than the 8L90E, but has the same grouping of four gearsets and five clutches. Also like the 8L90, the 8L45 incorporates special components necessary for supporting start/stop engines.
One of the major changes on the 8L45 vs the 8L90 is the gear ratios. With a wide 7.0 overall gear ratio and numerically higher 4.62 first gear, the 8L45 will help drivers “start off more confidently, with a greater feeling of immediate performance.” The gear ratios and smaller steps between gears also result in a 5 percent fuel economy benefit over a six-speed automatic.

“The 8L45 was designed to enhance the CT6’s driving experience, offering a strong balance between performance and efficiency,” said Bill Goodrich, GM’s assistant chief engineer for eight-speed automatic transmissions “Perhaps its best attribute will be that customers really won’t notice it – they’ll simply enjoy the CT6’s seamless, smooth driving experience and on-demand performance.”

Read more: http://www.camaro6.com/forums/showthread.php?t=400708

And some more info:
http://media.gm.com/media/us/en/cadi...spd-trans.html

fradaj · 03-20-2015, 05:19 PM

An 8 speed paddle shift would be just about perfect, especially with a 3.91 rear end.

DrkPhx · 03-20-2015, 07:30 PM

4.62 first gear ratio is insane. I know this is really to help acceleration with the lower hp motors with less torque; but GM should consider putting these ratios in the hi-performance variants with a different rear gear set.

Quote:

One of the major changes on the 8L45 vs the 8L90 is the gear ratios. With a wide 7.0 overall gear ratio and numerically higher 4.62 first gear, the 8L45 will help drivers “start off more confidently, with a greater feeling of immediate performance.”

SuperSound · 03-20-2015, 07:31 PM

Yep, guess there was truth to the rumors the ATS wouldn't fit the 8L90 and why it didn't get it this year. They were developing one specifically for the V6 engines coming.

iPODFAN11 · 03-21-2015, 07:41 AM

Quote:

Originally Posted by SuperSound

Yep, guess there was truth to the rumors the ATS wouldn't fit the 8L90 and why it didn't get it this year. They were developing one specifically for the V6 engines coming.

Fits in the ATS. ATS-V has the 8L90. The issue is more like why put such a high torque capacity transmission that weighs a bit more that doesn't need that much transmission. Hence 8L45. Handle the 3.6 na and the 2.0T better.

Number 3 · 03-21-2015, 07:53 AM

GM already has the 8 speed Aisin transmission in the CTS. This is just the in house 8 speed for the lower output powertrains.

Not sure this means across the board application replacing the current 6 speed or not.

SuperSound · 03-21-2015, 11:10 AM

Quote:

Originally Posted by iPODFAN11

Fits in the ATS. ATS-V has the 8L90. The issue is more like why put such a high torque capacity transmission that weighs a bit more that doesn't need that much transmission. Hence 8L45. Handle the 3.6 na and the 2.0T better.

Quote:

Originally Posted by Number 3

GM already has the 8 speed Aisin transmission in the CTS. This is just the in house 8 speed for the lower output powertrains.

Not sure this means across the board application replacing the current 6 speed or not.

Actually the reason was in the info I just overlooked it....start/stop capability. But I agree they probably took the opportunity to save on lowered torque capacity.

HDRDTD · 03-21-2015, 11:46 AM

Quote:

Originally Posted by SuperSound

Actually the reason was in the info I just overlooked it....start/stop capability. But I agree they probably took the opportunity to save on lowered torque capacity.

I thought another reason for the lessor trans was to clear the trans tunnel in the Camaro variation of the ATS?

SuperSound · 03-21-2015, 11:52 AM

Quote:

Originally Posted by HDRDTD

I thought another reason for the lessor trans was to clear the trans tunnel in the Camaro variation of the ATS?

Considering what we know about the chassis being 70% unique to the Camaro, I would say they designed it to easily accommodate the 8L90, which is bigger and heavier than this new unit I believe. Neither trans has been confirmed for the Camaro, but it seems like a sure bet.

SuperSound · 05-19-2015, 10:02 PM

Resurrecting this info in case anyone wants to read about it. This will be the auto for the LGX and 2.0T cars.

DannyB · 05-20-2015, 03:08 AM

Quote:

Originally Posted by SuperSound

Resurrecting this info in case anyone wants to read about it. This will be the auto for the LGX and 2.0T cars.

Thanks for resurrecting this!! I may end up getting a V6 dependent on how much weight is cut on it.

KMPrenger · 05-20-2015, 11:38 AM

Just hope it has the same super fast shifts at WOT!

SuperSound · 05-20-2015, 11:41 AM

Quote:

Originally Posted by KMPrenger

Just hope it has the same super fast shifts at WOT!

I think so based on what autoblog said about there time in the v6 A8.

03-20-2015, 04:34 PM	#1
SuperSound Drives: '17 Camaro 2SS A8 Join Date: Jan 2015 Location: Eastern NC Posts: 5,063 View My Garage	GM 8L45 8 speed transmission Some more info on the possible transmission for the V6 Camaros. Along with debuting a new engine family for the upcoming luxury sedan, Cadillac today rolled out a new 8L45 eight-speed automatic transmission to debut in the 2016 CT6 later this month. The new eight-speed paddle shift transmission will also become available in the mid-size CTS and compact ATS for the 2016 model year, the automaker announced. The 8L45 transmission, based on the same eight-speed transmission family as the 8L90 introduced in the 2015 Corvette Z06, will be available on 3.6-liter versions of the CT6, on 2.0- and 3.6-liter versions of the CTS and on 2.0-, 2.5- and 3.6-liter versions of ATS. The transmission has been scaled to match the performance on offer from less powerful engines, with the 8L90 serving in high horsepower and high torque applications like the ATS-V, CTS-V and twin-turbo CT6. Like the 8L90, the 8L45 occupies the same space as GM’s previous six-speed while weighing less. The 8L45 is actually a bit smaller and approximately 33 pounds lighter than the 8L90E, but has the same grouping of four gearsets and five clutches. Also like the 8L90, the 8L45 incorporates special components necessary for supporting start/stop engines. One of the major changes on the 8L45 vs the 8L90 is the gear ratios. With a wide 7.0 overall gear ratio and numerically higher 4.62 first gear, the 8L45 will help drivers “start off more confidently, with a greater feeling of immediate performance.” The gear ratios and smaller steps between gears also result in a 5 percent fuel economy benefit over a six-speed automatic. “The 8L45 was designed to enhance the CT6’s driving experience, offering a strong balance between performance and efficiency,” said Bill Goodrich, GM’s assistant chief engineer for eight-speed automatic transmissions “Perhaps its best attribute will be that customers really won’t notice it – they’ll simply enjoy the CT6’s seamless, smooth driving experience and on-demand performance.” Read more: http://www.camaro6.com/forums/showthread.php?t=400708 And some more info: http://media.gm.com/media/us/en/cadi...spd-trans.html __________________ Current: '17 2SS Hyper Blue, A8, MRC, NPP Past: '99 SS Camaro A4, '73 Camaro 383 A3 "Voices in your head are not considered insider information." 3800 Status - 6/16/16 (Built!) 6000 status - 6/29/16 (Delivered!)

03-20-2015, 07:31 PM	#4
SuperSound Drives: '17 Camaro 2SS A8 Join Date: Jan 2015 Location: Eastern NC Posts: 5,063 View My Garage	Yep, guess there was truth to the rumors the ATS wouldn't fit the 8L90 and why it didn't get it this year. They were developing one specifically for the V6 engines coming. __________________ Current: '17 2SS Hyper Blue, A8, MRC, NPP Past: '99 SS Camaro A4, '73 Camaro 383 A3 "Voices in your head are not considered insider information." 3800 Status - 6/16/16 (Built!) 6000 status - 6/29/16 (Delivered!)

03-21-2015, 07:53 AM	#6
Number 3 Hail to the King baby! Drives: '19 XT4 2.0T & '22 VW Atlas 2.0T Join Date: Dec 2008 Location: Illinois Posts: 12,174 View My Garage	GM already has the 8 speed Aisin transmission in the CTS. This is just the in house 8 speed for the lower output powertrains. Not sure this means across the board application replacing the current 6 speed or not. __________________ "Speed, it seems to me, provides the one genuinely modern pleasure." - Aldous Huxley

05-19-2015, 10:02 PM	#10
SuperSound Drives: '17 Camaro 2SS A8 Join Date: Jan 2015 Location: Eastern NC Posts: 5,063 View My Garage	Resurrecting this info in case anyone wants to read about it. This will be the auto for the LGX and 2.0T cars. __________________ Current: '17 2SS Hyper Blue, A8, MRC, NPP Past: '99 SS Camaro A4, '73 Camaro 383 A3 "Voices in your head are not considered insider information." 3800 Status - 6/16/16 (Built!) 6000 status - 6/29/16 (Delivered!)

05-20-2015, 11:38 AM	#12
KMPrenger Drives: 16 Camaro SS, 15 Colorado Join Date: May 2009 Location: Jefferson City, Missouri Posts: 13,943	Just hope it has the same super fast shifts at WOT! __________________ 2016 Camaro 1SS - 8-speed - NPP - Black bowties 2010 Camaro 1LT V6 (Sold. I will miss her!)

03-20-2015, 05:19 PM	#2
fradaj Drives: RS Join Date: Jan 2013 Location: Florida Posts: 1,037	An 8 speed paddle shift would be just about perfect, especially with a 3.91 rear end.

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