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4 speed question

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01-03-2007, 01:16 AM

Mr70

Yenko Contributing Member

Join Date: Jan 2001

Location: Illinois

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Re: 4 speed question

That M-20 trans. code decodes it came on a 1969 Oldsmobile A-body originally.
3 is Oldsmobile.
9 is the last model year digit.
M stands for the Lansing Mi. plant.

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