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Does a 3.4 transmission bolt on 3.8?

No, a 3.4L transmission will generally not bolt directly onto a 3.8L engine. While they might be from the same manufacturer and even the same generation of vehicles, the bell housings (the part of the transmission that connects to the engine) are different sizes and bolt patterns. You'd need an adapter plate, which is a complex and potentially unreliable modification, to make them compatible. It's not a simple bolt-on swap.