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I have a2012 GMC SIRRA 5.3, 6-SPEED TRANSMISSION. Will a 2005 Yukon 5.3, 6-speed transmission interchange or fit?

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The only transmission available in the 2005 Yukon is a 4 speed. It could have been a 4L60E equipped with the 4.3/4.8/5.3 engines or 4L80E if equipped with the 6.0L engine. Your 2012 Sierra is a 6L80E. Neither of the available Yukon transmissions will work in place of your 6L80E. They might fit (ie: bolt to the engine), but they will not function, mainly because the transmission control is completely different between the two.

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