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01 GMC Sierra trans fluid blew out

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So I was driving then saw smoke pulled over then all the fluid was just poring out, it was on the left side of the transmission, don’t think it was the first time old owner had new field in the bottle, a funnel, and the fluid that came out looked new not even 1000miles. What could it be. Truck was 4.8l but switched to 5.3l. Truck is bagged but didn’t low to hit anything

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