Home » Public Forums » GMCnet » [GMCnet] C8 Transmission
| [GMCnet] C8 Transmission [message #345900] |
Wed, 31 July 2019 21:27  |
Sammy Williams
Messages: 522
Registered: August 2010
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Musing out loud:
Would the new C8 (2020 Corvette - mid engine) transmission be an excellent
replacement for the GMC (in an effort to get modern multi-speed gearing to
improve gas mileage and cruise RPMs) It so far looks promising. Such a
trans could be fit to the GMC with an adapter-- or if using a Chevy engine
possibly go in with mods.
Sammy Williams
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| Re: [GMCnet] C8 Transmission [message #345901 is a reply to message #345900] |
Wed, 31 July 2019 21:39  |
tmsnyder
Messages: 151
Registered: January 2014
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Wouldn't the engine end up in front of the axle shafts? Seems like it would be popping out the grill but I could be missing something.
Todd Snyder, Buffalo NY
1976 Eleganza II
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| Re: [GMCnet] C8 Transmission [message #345919 is a reply to message #345911] |
Thu, 01 August 2019 13:12 |
Hal StClair
Messages: 971
Registered: March 2013
Location: Rio Rancho NM
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'IF' you could run the trans in reverse, and 'IF' you could get the programming to run it stand alone, you might get a reverse rotation cam and run the motor in reverse and make it work with the motor behind the trans, 'IF' you could afford the whole package.
Hal
"I enjoy talking to you. Your mind appeals to me. It resembles my own mind, except you happen to be insane."
1977 Royale 101348,
1977 Royale 101586, Diesel powered,
1974 Eagle Bus 45',w/slideout,
Rio Rancho, NM
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| Re: [GMCnet] C8 Transmission [message #345920 is a reply to message #345900] |
Thu, 01 August 2019 13:25 |
TR 1
Messages: 348
Registered: August 2015
Location: DFW
Karma: -7
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Unfortunately, the new C8 transmission is also a dual clutch, automated manual.. Not a traditional slush box automatic. Not sure how that would work with the loads we have.
Also, as mentioned above, it would be a very long assembly, and the motor would likely be sticking out the front of the grill..
Interestingly, the Corvette has had a transaxle since I think the C5... It's just been mounted at the end of a torque tube. I want to say I've seen conversions where a standard automatic like a 4L80 or 6L80 from say a camaro has been mounted to a corvette transaxle rear assembly for use in mid-engine swaps, etc...
Mark S. '73 Painted Desert,
Manny 1 Ton Front End,
Howell Injection,
Leigh Harrison 4bag and Rear Brakes,
Fort Worth, TX
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| Re: [GMCnet] C8 Transmission [message #345922 is a reply to message #345919] |
Thu, 01 August 2019 13:38 |
TR 1
Messages: 348
Registered: August 2015
Location: DFW
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Hal StClair wrote on Thu, 01 August 2019 13:12'IF' you could run the trans in reverse, and 'IF' you could get the programming to run it stand alone, you might get a reverse rotation cam and run the motor in reverse and make it work with the motor behind the trans, 'IF' you could afford the whole package.
Hal
That's interesting, Hal... Conversions to do this are common on marine engines... Marine engines would also be suitable for the type of use our engines see in motorhome service...
Would the Torque Converter need to be changed to reverse rotation as well? Transmission pumps too, maybe?...
Mark S. '73 Painted Desert,
Manny 1 Ton Front End,
Howell Injection,
Leigh Harrison 4bag and Rear Brakes,
Fort Worth, TX
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| Re: [GMCnet] C8 Transmission [message #345924 is a reply to message #345922] |
Thu, 01 August 2019 16:19 |
Hal StClair
Messages: 971
Registered: March 2013
Location: Rio Rancho NM
Karma: -12
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I'd guess the pump in the DCT might be problematic but I really have no real information to go on. As for the torque converter, the vanes would be reversed so I don't think they could be made to work reversed. It's always fun to re-engineer these things. I'm in the very early stages of a completely different approach to powering a GMC. When I get a little further along I'll share a few more details. Hal
"I enjoy talking to you. Your mind appeals to me. It resembles my own mind, except you happen to be insane."
1977 Royale 101348,
1977 Royale 101586, Diesel powered,
1974 Eagle Bus 45',w/slideout,
Rio Rancho, NM
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| Re: [GMCnet] C8 Transmission [message #345929 is a reply to message #345924] |
Thu, 01 August 2019 20:14 |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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Bump the front of the grille out like one of those old corrugated Citroen bread trucks!!! Remember the Rolls Royce grilles on VW Beetles? Something real classy like that. They’ll never know it has a Chevy engine.
Still - I’d love to have a modern drivetrain alternative. I had hopes for the Diesel Ram vans, but I don’t think they are importing them, and they probably aren’t up to the task. I’m thinking Tesla…
Larry Davick
A Mystery Machine
1976 Palm Beach
Fremont
> On Aug 1, 2019, at 2:19 PM, Hal StClair via Gmclist wrote:
>
> I'd guess the pump in the DCT might be problematic but I really have no real information to go on. As for the torque converter, the vanes would be
> reversed so I don't think they could be made to work reversed. It's always fun to re-engineer these things. I'm in the very early stages of a
> completely different approach to powering a GMC. When I get a little further along I'll share a few more details. Hal
> --
> 1977 Royale 101348,
>
> 1977 Royale 101586, Diesel powered,
>
> 1975 Eleganza II, 101230,
>
> 1974 Eagle Bus 45',w/slideout,
>
> Rio Rancho, NM
>
> _______________________________________________
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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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| Re: [GMCnet] C8 Transmission [message #345945 is a reply to message #345900] |
Fri, 02 August 2019 10:57 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Interesting question for the Gurus. Can the ring gear in a GMC final drive be swapped side to side as it can in an old VW transaxle? Ask me how I learnt this trick on a VW buss with a 4 speed reverse that screamed but only one forward speed of like 10mp hwide open. Seems as if, if it could, we could evaluate other transmission possibilities without worrying about direction of rotation.
Couldja>?
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] C8 Transmission [message #345950 is a reply to message #345945] |
Fri, 02 August 2019 11:19 |
powwerjon
Messages: 849
Registered: March 2013
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Johnny,
Yes the ring gear assemble can be reversed in the VW Bus transaxle. I had 21 window with sunroof that I bought in early 1969 without an engine. I also had a 64 corvair 110 HP motor. Bought the Crown adapter plate and starter adapter and had a local VW service place swap the ring gear assembly and set it up. The bus ran extremely well and was a cruiser with the extra HP.
JR Wright
Michigan
> On Aug 2, 2019, at 11:57 AM, Johnny Bridges via Gmclist wrote:
>
> Interesting question for the Gurus. Can the ring gear in a GMC final drive be swapped side to side as it can in an old VW transaxle? Ask me how I
> learnt this trick on a VW buss with a 4 speed reverse that screamed but only one forward speed of like 10mp hwide open. Seems as if, if it could, we
> could evaluate other transmission possibilities without worrying about direction of rotation.
> Couldja>?
>
>
> --johnny
> --
> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> I forgive them all, save those who hurt the dogs. They must answer to me in hell
>
>
> _______________________________________________
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| Re: [GMCnet] C8 Transmission [message #345952 is a reply to message #345950] |
Fri, 02 August 2019 11:38 |
Mike Kelley
Messages: 467
Registered: February 2017
Karma: -2
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John W.:
I knew there was some reason I liked you so much - nice taste in vehicles!
Mike/The Corvair a holic
Sent from my iPhone
> On Aug 2, 2019, at 11:19 AM, John Wright via Gmclist wrote:
>
> Johnny,
> Yes the ring gear assemble can be reversed in the VW Bus transaxle. I had 21 window with sunroof that I bought in early 1969 without an engine. I also had a 64 corvair 110 HP motor. Bought the Crown adapter plate and starter adapter and had a local VW service place swap the ring gear assembly and set it up. The bus ran extremely well and was a cruiser with the extra HP.
>
> JR Wright
> Michigan
>> On Aug 2, 2019, at 11:57 AM, Johnny Bridges via Gmclist wrote:
>>
>> Interesting question for the Gurus. Can the ring gear in a GMC final drive be swapped side to side as it can in an old VW transaxle? Ask me how I
>> learnt this trick on a VW buss with a 4 speed reverse that screamed but only one forward speed of like 10mp hwide open. Seems as if, if it could, we
>> could evaluate other transmission possibilities without worrying about direction of rotation.
>> Couldja>?
>>
>>
>> --johnny
>> --
>> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
>> Braselton, Ga.
>> I forgive them all, save those who hurt the dogs. They must answer to me in hell
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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>
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| Re: [GMCnet] C8 Transmission [message #345955 is a reply to message #345952] |
Fri, 02 August 2019 13:57 |
powwerjon
Messages: 849
Registered: March 2013
Karma: -2
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Thanks!
> On Aug 2, 2019, at 12:38 PM, Mike Kelley via Gmclist wrote:
>
> John W.:
> I knew there was some reason I liked you so much - nice taste in vehicles!
> Mike/The Corvair a holic
>
> Sent from my iPhone
>
>> On Aug 2, 2019, at 11:19 AM, John Wright via Gmclist wrote:
>>
>> Johnny,
>> Yes the ring gear assemble can be reversed in the VW Bus transaxle. I had 21 window with sunroof that I bought in early 1969 without an engine. I also had a 64 corvair 110 HP motor. Bought the Crown adapter plate and starter adapter and had a local VW service place swap the ring gear assembly and set it up. The bus ran extremely well and was a cruiser with the extra HP.
>>
>> JR Wright
>> Michigan
>>> On Aug 2, 2019, at 11:57 AM, Johnny Bridges via Gmclist wrote:
>>>
>>> Interesting question for the Gurus. Can the ring gear in a GMC final drive be swapped side to side as it can in an old VW transaxle? Ask me how I
>>> learnt this trick on a VW buss with a 4 speed reverse that screamed but only one forward speed of like 10mp hwide open. Seems as if, if it could, we
>>> could evaluate other transmission possibilities without worrying about direction of rotation.
>>> Couldja>?
>>>
>>>
>>> --johnny
>>> --
>>> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
>>> Braselton, Ga.
>>> I forgive them all, save those who hurt the dogs. They must answer to me in hell
>>>
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>>
>> _______________________________________________
>> GMCnet mailing list
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> _______________________________________________
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| Re: [GMCnet] C8 Transmission [message #345979 is a reply to message #345900] |
Sat, 03 August 2019 07:52 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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I know thw VW will reverse. My question is, will the GMC reverse?
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] C8 Transmission [message #345987 is a reply to message #345900] |
Sat, 03 August 2019 08:32 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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I don't wanna reve4rse the 425, it works fine like it is. I want to reverse the input to the final drive to offer other options.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] C8 Transmission [message #345992 is a reply to message #345990] |
Sat, 03 August 2019 09:15 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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These discussions are very good as it helps the coomunity.
On Sat, Aug 3, 2019 at 7:02 AM Matt Colie via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Johnny Bridges wrote on Sat, 03 August 2019 09:32
>> I don't wanna reve4rse the 425, it works fine like it is. I want to
> reverse the input to the final drive to offer other options.
>>
>> --johnny
>
> OK, Keep thinking.
> That is a very effiecent and inexpensive process that so many seem to lack
> the capability to do these days.....
> Matt
> --
> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan
> OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
>
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] C8 Transmission [message #345995 is a reply to message #345900] |
Sat, 03 August 2019 09:28 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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In my imagination if you could reverse the C8 powertrain it would be intruding into the step area and even the hallway.
John Lebetski
Woodstock, IL
77 Eleganza II
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