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Transmissions…wondering

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Old 05-24-2024, 09:48 PM
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Transmissions…wondering
I understand from what I read the the 4T45E was used in a few different models including HHR’s….my question is…can a different GM model transmission be put in an HHR and function correctly or is there different gear ratios and or programming?
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Old 05-25-2024, 05:27 AM
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You can swap 4T45E transmission, there’s a compatibility list on line, yes there are different gear ratios
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Old 05-26-2024, 09:54 AM
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Originally Posted by Gearhead1
I understand from what I read the the 4T45E was used in a few different models including HHR’s….my question is…can a different GM model transmission be put in an HHR and function correctly or is there different gear ratios and or programming?
What would you like different? The 4T45 is overkill for your car, even used in some GM 6-cylinder cars.

I've wondered if changing the ratio would freak out the ESC. Maybe someone here knows. Seems you can change manual transmission ratios without trouble.
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Old 05-26-2024, 10:01 AM
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The 4T45E is the automatic transmission in every automatic HHR. The final drive ratios aren’t that different to confuse the TCM
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Old 05-26-2024, 04:28 PM
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Originally Posted by PulpFriction
What would you like different? The 4T45 is overkill for your car, even used in some GM 6-cylinder cars.

I've wondered if changing the ratio would freak out the ESC. Maybe someone here knows. Seems you can change manual transmission ratios without trouble.
no change….just extra transmission possibly
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