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01 4.8L cat back

txjcb

By txjcb
October 15, 2003 in 1999-2013 Silverado 1500 & Sierra 1500

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txjcb

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txjcb

Posted October 15, 2003

Posted October 15, 2003

I put in a cat back duals. When I realy get on it the transmition does not shift until It gets to 5500 - 5600 RPMs. Is this correct?

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