Question about 1991 GMC C1500

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How do I identify which trans is in a 1991 GMC C1500

I just purchased a 1991 GMC C1500 5.7L with 4 speed auto transmission. How do I identify which one it actually is (4L60, 4L60E OR 4L80E)?

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Check on the side of the trans there should be a plate with the numbers on that identify the trans.

Posted on Oct 01, 2009

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