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Thread: New corvette C8 gearbox fit int the GTM

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    Senior Member Edgeman's Avatar
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    New corvette C8 gearbox fit int the GTM

    •TR-9070 DCT 7-speed dual clutch transmission Made by Tremec, is this an option for the GTM?
    GTM #370
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    Senior Member beeman's Avatar
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    I'm cannot imagine you wouldn't be able to make it fit, you would need a way to control it though. How would you procure one? I see it being a great option in a few years.
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    Senior Member jamesfr58's Avatar
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    Yea, this is a OEM dealer only item and my bet is they will protect what they have and it wont be for sale any time soon. If you found one from wrecked C8 you would also need all the electronics that go along with it to control the transmission as well and make the interface with the ECU and engine so would add a new level of complexity, but then again anything is possible.

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    Senior Member beeman's Avatar
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    I could see myself ripping out my Porsche gearbox in the future...
    MK3.1 2004 Mach 1 donor. ABS, PS, TC.
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    Senior Member Edgeman's Avatar
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    It is listed on there web site. I think this would be a perfect time for Factory Five to Update this car, with this option for the GTM. I know they have been working on the new GTM with front engine but I think a true supercar is a mid mounted engine. JMHO
    GTM #370
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    Not to be a downer because I love the GTM, but why would anyone spend $50-$60k on a GTM when you can now have the equivalent Vette, at the same price point, with all the factory computers, safety equipment, and performance? As I said in another thread, if the C8 is really under $60k, it will pretty much make our GTMs obsolete.
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    Steve >> aka: GoDadGo
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    Once the C-8 is out there a while I'm sure more than a few will end up down South at Dino's!

    https://corvettesalvage.com/

    They are the largest Corvette Only salvage yard in the nation and located in Picayune Mississippi which is about 45 miles North of New Orleans.

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    Senior Member TDSapp's Avatar
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    Quote Originally Posted by GoDadGo View Post
    Once the C-8 is out there a while I'm sure more than a few will end up down South at Dino's!

    https://corvettesalvage.com/

    They are the largest Corvette Only salvage yard in the nation and located in Picayune Mississippi which is about 45 miles North of New Orleans.
    Yeah I was thinking that some of them are not even going to make it one week off the lot before they are wrecked. It happens now all the time as it is. Granted, the salvage yard is going to be asking a good price for the parts but still cheaper than new from GM.


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    Senior Member CDXXVII's Avatar
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    What he said exactly.

    Quote Originally Posted by crash View Post
    Not to be a downer because I love the GTM, but why would anyone spend $50-$60k on a GTM when you can now have the equivalent Vette, at the same price point, with all the factory computers, safety equipment, and performance? As I said in another thread, if the C8 is really under $60k, it will pretty much make our GTMs obsolete.
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    Steve >> aka: GoDadGo
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    Quote Originally Posted by TDSapp View Post
    Yeah I was thinking that some of them are not even going to make it one week off the lot before they are wrecked. It happens now all the time as it is. Granted, the salvage yard is going to be asking a good price for the parts but still cheaper than new from GM.


    Tim
    Tim,

    I think this is going to be a sort of "Hell Cat Moment" for more than a few new Mid-Engine C-8 guys.
    Folks not accustom to piloting a mid-engine machine will make mistakes prior to learning the dynamics of their car.
    This is the exact reason why I have my Rev Limiter set at 4,000 RPM on my MK-4 while I'm learning to drive it.

    Steve
    Last edited by GoDadGo; 07-24-2019 at 11:32 AM.

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    I don't think the TR-9070 DCT 7-speed dual clutch transmission is the unit used in the C8. I'm sure the TR-9070 is for rear wheel drive cars.

    The C8 DCT is an 8-speed transaxle. If you could get one, don't hold your breath, I'm sure you could shoehorn it in. But as previously indicated there will be a bunch of control electronics that most likely won't be compatible. Now maybe if you could find the complete drive package you'd have a better chance.

    Jim

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    Quote Originally Posted by crash View Post
    Not to be a downer because I love the GTM, but why would anyone spend $50-$60k on a GTM when you can now have the equivalent Vette, at the same price point, with all the factory computers, safety equipment, and performance? As I said in another thread, if the C8 is really under $60k, it will pretty much make our GTMs obsolete.
    There’s one box that the C8 won’t check: built by the owner. For many of the people on this forum, that’s the most important box.

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  15. #13

    Steve >> aka: GoDadGo
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    Here's The New C-8 Ya'll!

    https://youtu.be/NZGCJu2OaAg

    https://youtu.be/n5eb0R095Ys

    This Die Hard Chevy Guy Still Thinks The Ford GT Looks Better!
    Last edited by GoDadGo; 07-23-2019 at 09:26 PM.

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    EFI Rules and Carbs Drool Arrowhead's Avatar
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    Quote Originally Posted by beeman View Post
    How would you procure one? I see it being a great option in a few years.
    Step 1 - rent a u haul trailer

    Step 2 - camp out at your favorite cars and coffee in spring of 2020

    Step 3 - set up your camp chair at the traditional "don't burnout while leaving cars and coffee" but they do anyway spot

    Step 4 - Patiently sip your latte around 10-11 and watch the show (throw a little bleach on the pavement to get the juices flowing)

    Step 5 - When that C8 owner takes the bait, be ready with a stack of cash and the trailer

    Step 6 - Load up your new donor car and place your GTM order when you get home!
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    Senior Member TDSapp's Avatar
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    Quote Originally Posted by Arrowhead View Post
    Step 1 - rent a u haul trailer

    Step 2 - camp out at your favorite cars and coffee in spring of 2020

    Step 3 - set up your camp chair at the traditional "don't burnout while leaving cars and coffee" but they do anyway spot

    Step 4 - Patiently sip your latte around 10-11 and watch the show (throw a little bleach on the pavement to get the juices flowing)

    Step 5 - When that C8 owner takes the bait, be ready with a stack of cash and the trailer

    Step 6 - Load up your new donor car and place your GTM order when you get home!


    Or make friends with the GM at a Chevy dealership and have him call you when a new owner shows up to collect the car. Then show up and wait about a block away. As Steve said earlier it's a Hell Cat Moment. There were plenty of times where the new owner romped on the throttle leaving the lot and totaled it within a block of the dealership.


    Granted the Coffee and Cars will probably have more of them at the same time. And once one of them shows off how much power their checkbook gave them more of them will do it.
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    Steve >> aka: GoDadGo
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    Quote Originally Posted by TDSapp View Post
    As Steve said earlier it's a Hell Cat Moment.
    For The Record:

    I added the Rev Limiter to my MK-4 because I almost had one of those Hell Cat Moments during some early Go-Dad-Go-Kart Testing!

    https://youtu.be/wOID7yvBRPU

    The car is set at 4,000 RPM because I often can suffer from a Special Kind of Stupid that can land you in a ditch or get you killed.
    Last edited by GoDadGo; 07-24-2019 at 12:23 PM.

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  21. #17
    Not a waxer Jeff Kleiner's Avatar
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    Quote Originally Posted by Arrowhead View Post
    Step 1 - rent a u haul trailer

    Step 2 - camp out at your favorite cars and coffee in spring of 2020

    Step 3 - set up your camp chair at the traditional "don't burnout while leaving cars and coffee" but they do anyway spot

    Step 4 - Patiently sip your latte around 10-11 and watch the show (throw a little bleach on the pavement to get the juices flowing)

    Step 5 - When that C8 owner takes the bait, be ready with a stack of cash and the trailer

    Step 6 - Load up your new donor car and place your GTM order when you get home!
    One possible flaw with your plan---it assumes that you will still be able to order a GTM by spring of 2020

    Quote Originally Posted by GoDadGo View Post
    The car is set at 4,000 RPM because I often can suffer from a Special Kind of Stupid that can land you in a ditch or get you killed.
    Don't kid yourself Steve; it's easy enough to get real stupid well below 4,000

    Jeff

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  23. #18
    Senior Member Presto51's Avatar
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    Quote Originally Posted by Jeff Kleiner View Post
    One possible flaw with your plan---it assumes that you will still be able to order a GTM by spring of 2020 ;Jeff
    Jeff you know something we don't know? Insider information

    Ron
    "May you be in heaven a full half hour before the Devil knows you're dead"

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    Steve >> aka: GoDadGo
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    Quote Originally Posted by Presto51 View Post
    Jeff you know something we don't know? Insider information

    Ron
    Jeff is sort of like the Wizard of Oz because he seems to be all knowing all the time so I decided to asked the 8-Ball that I keep on my desk and the response was:

    My Sources Say Yes!
    Last edited by GoDadGo; 07-24-2019 at 12:43 PM.

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    Steve >> aka: GoDadGo
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    Quote Originally Posted by Jeff Kleiner View Post
    Don't kid yourself Steve; it's easy enough to get real stupid well below 4,000

    Jeff
    4,000 RPM's Is Plenty Stupid For Now!

    4th Gear....5th Gear....6th Gear
    ...1.00..........0.75..........0.50

    .MPH-4........MPH-5......MPH-6
    ..82.95.......110.60......165.90
    Last edited by GoDadGo; 07-24-2019 at 01:06 PM.

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    Quote Originally Posted by crash View Post
    Not to be a downer because I love the GTM, but why would anyone spend $50-$60k on a GTM when you can now have the equivalent Vette, at the same price point, with all the factory computers, safety equipment, and performance? As I said in another thread, if the C8 is really under $60k, it will pretty much make our GTMs obsolete.
    Anyone can buy a C8 Corvette. How many have the skill and tenacity to build a GTM? Be proud!

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    What transaxle?

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    Seasoned Citizen NAZ's Avatar
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    I thought a mid-engine Corvette would be the end of an iconic car. Evidently others feel it too, the new model orders have almost meet the planned production volume. Speculators or mid-engine enthusiasts? Either way, looks like the trans will be made from unobtainium -- good luck finding one you can afford.
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    Senior Member beeman's Avatar
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    Quote Originally Posted by NAZ View Post
    made from unobtainium -- good luck finding one you can afford
    Actually it's amazing how CHEAP each component of this car is relatively.
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    Senior Member flotowngtm's Avatar
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    Its funny how many people think that this transaxle is going to be so hard to get!

    Its a CORVETTE! The Ricardo out of the Ford GT has been for sale all over the place through the years and that's a much lower volume car. It may take a little while before we can get our hands on one but it will happen.

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    VRaptor SpeedWorks, LLC's Avatar
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    The hard part will be figuring out how to control it, I think.....as it will likely tied directly to the engine ECU....as well as other control modules? Sort of like trying to control the AC compressor with one of the newer LS3 crate engine ECU's......can't do it....at least not easily.
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    Quote Originally Posted by flotowngtm View Post
    Its funny how many people think that this transaxle is going to be so hard to get!

    Its a CORVETTE! The Ricardo out of the Ford GT has been for sale all over the place through the years and that's a much lower volume car. It may take a little while before we can get our hands on one but it will happen.
    The Ricardo is/was available in good numbers only because of the manufacturing flaw that required a full recall of that transaxle. Ford made Ricardo produce an entire other batch, one for one, of transaxles so that they could be swapped out of the Ford GT with the fix already done in the transaxle. Then all the recalled transaxles hit the after market at "reasonable" prices, but are drying up now. A Ricardo will cost you WAY more than a Mendeola at this point.

    I believe you all are right...the trick will be the electronics for the C8 transaxle. If there are enough out there, I am sure someone wil come up with some sort of controller. Many of the higher end ECUs will control transmissions already, so it is likely just a software problem.
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    The more I read about the complexity of the production cars, the more I appreciate the simplicity of the roadster. The slight concession may be a coyote instead of the small block. But to me, this is where pure motoring is at.

  36. #29

    Steve >> aka: GoDadGo
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    Look For A C-8 Trans-axle At A Junk Yard Near You!

    https://youtu.be/jTcjSyujMU8

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    So Leno has a blue C8, this incident appears to have been in the hills of CA, and there is camera equipment on the roof of the C8. Coincidence? I think not.

    Wonder if he will show the incident on his show?

    Also looks like he had a passenger as the passenger side air bag is also deployed.
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  39. #31
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    That didn't take long LOL

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    Senior Member Presto51's Avatar
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    Quote Originally Posted by crash View Post
    So Leno has a blue C8, this incident appears to have been in the hills of CA, and there is camera equipment on the roof of the C8. Coincidence? I think not.

    Wonder if he will show the incident on his show?

    Also looks like he had a passenger as the passenger side air bag is also deployed.
    Or

    Maybe Leno was using one of the pre-production "mules" that was going to the great crusher in the sky when it's all said and done?

    This way it will give GM engineers "real life" crash data, and for Jay's hard work they'll gift him a regular production example

    Got your Copart Account ready??

    Ron
    "May you be in heaven a full half hour before the Devil knows you're dead"

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    There would be a weight penalty as the C-8 trans-axle supposedly weighs 341 pounds... twice the weight of the Mendeola SDR5.

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    Quote Originally Posted by jgtm View Post
    There would be a weight penalty as the C-8 trans-axle supposedly weighs 341 pounds... twice the weight of the Mendeola SDR5.
    OUCH! Kind of hard to believe it weighs THAT much. It looks to be relatively compact.
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    The C8 weighs around 3500 pounds if the article below is accurate.


    https://www.hagerty.com/articles-vid...corvette-specs

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    Senior Member Presto51's Avatar
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    Quote Originally Posted by jgtm View Post
    There would be a weight penalty as the C-8 trans-axle supposedly weighs 341 pounds... twice the weight of the Mendeola SDR5.
    I'm not understanding the weight penalty issues, unless it applies to certain racing classes?

    Thanks

    Ron
    "May you be in heaven a full half hour before the Devil knows you're dead"

  45. #37
    VRaptor SpeedWorks, LLC's Avatar
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    Quote Originally Posted by Presto51 View Post
    I'm not understanding the weight penalty issues, unless it applies to certain racing classes?

    Thanks

    Ron
    Weight penalty as in....you could either build a GTM that weighs 2500lbs with a Porsche or Mendy trans.....or build a GTM that weighs 2670 with the Vette transaxle.....all other things being equal. Since the low weight is biggest performance advantage the GTM has over a similar production car, the addition of 170 lbs would be a pretty hefty "penalty" to drag around.
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  46. #38
    Senior Member Presto51's Avatar
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    Okay I get it, the old butt seat dyno, which in my case, is not that sensitive to notice the extra poundage, but would notice the compensation, of three extra gears, and the millisecond speed in gear changes.

    Thanks for the explanation
    .

    Ron
    "May you be in heaven a full half hour before the Devil knows you're dead"

  47. #39
    VRaptor SpeedWorks, LLC's Avatar
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    Agreed.....if the electronics of the transaxle aren't so embedded in the engine programming to be virtually impossible to "work around", the extra gears and gear changes would be a definite plus. The other thing to consider is that IMO, 100% of that extra weight ends up in exactly the wrong place for everything but straight-line drag racing. The GTM is already what.....40/60 front/rear weight split?....and 100% of the extra weight of the new 'Vette transaxle would be behind the rear axles.....adding weight to the rear and actually taking weight away from the front.
    Shane Vacek
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    Senior Member Presto51's Avatar
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    All solid, valid points to consider.

    The Vette transaxle install can be accomplished, but when all said and done, you will more likely do a complete redesign of the GTM.

    You might have more fun, waiting for a Copart sale and rebuilding a totaled C8.

    Thanks

    Ron
    "May you be in heaven a full half hour before the Devil knows you're dead"

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