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 4Likes
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1
Post By Tommy
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1
Post By eschaider
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2
Post By Tommy
05-14-2023, 09:16 AM
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Registered User
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Join Date: May 2023
Cobra Make, Engine:
Posts: 1
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Swapping Gear Box New T56 Magnum
Hi there,
I'm a very happy 2015 RT3 owner.
My builder is doing some engine work on my LS2 and it's looking like we'll have to update the tranny to a T56 magnum. I'm currently running a NV3500 5 speeds.
Does anyone know if we'll have to modify the driveshaft or any other work to match the new T56 magnum? It's an LS T56 magnum.
Thanks!
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05-14-2023, 09:52 AM
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CC Member
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Join Date: Feb 2006
Location: Gilroy,
CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor
Posts: 2,719
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The simple answer is a high probable yes.
Measure the overall length of the two transmissions from the tailshaft ending point to the bell housing surface. If they are not the same, then your driveshafts will not be the same. The other metric you need to pay attention to is the tailshaft diameter and spline count. If they are not the same, you will require a new yolk to match the output shaft diameter and spline count.
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Help them do what they would have done if they had known what they could do.
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05-14-2023, 11:21 AM
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Join Date: Apr 2021
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I'd think the cost of a new drive shaft and yoke, if necessary, would be well worth it for the "56" tranny. BTW, there may be an issue with the rear cross member if the new tranny is markedly longer. Just my 2¢.
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05-14-2023, 08:00 PM
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CC Member
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Join Date: Feb 2002
Location: Dadeville,
AL
Cobra Make, Engine: Sold my EM.
Posts: 2,459
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I can't answer your technical questions. But I have a T56 Magnum in my Cheetah and I love the way it shifts. BTW, the drivetrain configuration in my Cheetah is such that the distance between the two U-joints on the driveshaft is about two inches.
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Tommy
Cheetah tribute completed 2021 (TommysCars.Weebly.com)
Previously owned EM Cobra
"Never attribute to malice that which is adequately explained by stupidity." - Hanlon's Razor
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05-15-2023, 12:37 AM
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CC Member
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Join Date: Feb 2006
Location: Gilroy,
CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor
Posts: 2,719
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With a driveshaft that long, Tommy, I would think you might experience some rather noticeable whipping if it were not perfectly straight and balanced. 
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Help them do what they would have done if they had known what they could do.
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05-15-2023, 04:52 AM
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Join Date: Feb 2002
Location: Dadeville,
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Cobra Make, Engine: Sold my EM.
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I understand. I ran the numbers through a "Driveshaft Critical Speed Calculator" and it said flex shouldn't be a problem until more than 5,000,000 RPM. 
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Tommy
Cheetah tribute completed 2021 (TommysCars.Weebly.com)
Previously owned EM Cobra
"Never attribute to malice that which is adequately explained by stupidity." - Hanlon's Razor
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05-15-2023, 12:56 PM
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CC Member
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Join Date: Feb 2006
Location: Gilroy,
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Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor
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Quote:
Originally Posted by Tommy
I understand. I ran the numbers through a "Driveshaft Critical Speed Calculator" and it said flex shouldn't be a problem until more than 5,000,000 RPM. |
Gotta love those 'Driveshaft Critical Speed Calculators'. What would we do without them? 👍
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Help them do what they would have done if they had known what they could do.
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05-16-2023, 01:27 PM
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Tommy, I'm thinking you have a Chevy engine in your Cheetah so maybe that 5,000,000 RPM isn't totally out of the question. |
05-16-2023, 02:43 PM
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Join Date: Feb 2002
Location: Dadeville,
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Cobra Make, Engine: Sold my EM.
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Quote:
Originally Posted by KarlzEE Bebout
Tommy, I'm thinking you have a Chevy engine in your Cheetah so maybe that 5,000,000 RPM isn't totally out of the question. |
It was on the Internet so I figured those guys must know what they're talking about. So that's where I set my rev limiter.
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Tommy
Cheetah tribute completed 2021 (TommysCars.Weebly.com)
Previously owned EM Cobra
"Never attribute to malice that which is adequately explained by stupidity." - Hanlon's Razor
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