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2005 Automatic spline count

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Old Mar 10, 2023 | 03:47 AM
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Default 2005 Automatic spline count

Is there a difference in spline count between the 2005 automatic transmission and the 2006+ manual transmission? Asking because I am thinking of doing the conversion to the 2006+ differential. I have been searching and researching this topic and am surprised at how little information is out there. Or my Google foo is weak on this subject.
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Old Mar 10, 2023 | 09:30 AM
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I think that all automatic have 30 spline. the base model and Z51 manual transmission have 27 spline differential and the Z06 zr1 GS have 30 spline differential .
hope this helps .call RPM
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Old Mar 11, 2023 | 02:18 PM
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Thank you for your input. I do wish more info was out there from people who have done the conversion. Maybe not many have done it with an automatic.
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Old Mar 12, 2023 | 12:58 AM
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Originally Posted by Last 1
I think that all automatic have 30 spline. the base model and Z51 manual transmission have 27 spline differential and the Z06 zr1 GS have 30 spline differential .
hope this helps .call RPM
That's true for the 2006 and later - the 2005 cars used the same diff as a C5, different from the 2006 and later C6's.
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Old Mar 12, 2023 | 01:00 AM
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Originally Posted by essixx
Is there a difference in spline count between the 2005 automatic transmission and the 2006+ manual transmission? Asking because I am thinking of doing the conversion to the 2006+ differential. I have been searching and researching this topic and am surprised at how little information is out there. Or my Google foo is weak on this subject.
Pretty sure your 4-speed automatic has a different output shaft setup. I'd check with a place like RPM transmissions, they should be able to tell you. Also, try posting or searching in the C5 section since that's the drivetrain you have in your 05.
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