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Old 11-29-2006, 06:11 PM
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Default Re: turbo 400 letter code for ls6 chevelle??

It should be a CY suffix.
The date assembled was stamped in the upper right,and the serial No. was stamped in the lower right.

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Old 11-29-2006, 06:23 PM
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Default Re: turbo 400 letter code for ls6 chevelle??

More info posted by Rob Clary...

CY & CX 400THM


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Old 11-29-2006, 09:10 PM
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Default Re: turbo 400 letter code for ls6 chevelle??

my trans is a 1970 cb??
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Old 11-29-2006, 11:54 PM
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Default Re: turbo 400 letter code for ls6 chevelle??

What year is your CB trans. tag?
The CB suffix was used beginning in 1966 up to 1977 on many engine applications.
If it shows a 1970 production year,then it came behind a 1970 454 LS-4/345HP & LS-5/390HP Big Passenger series vehicle only.
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Old 11-29-2006, 11:59 PM
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Default Re: turbo 400 letter code for ls6 chevelle??

it is a 1970 trans with the cb code thanks for the info Rich
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