On average, a 2014 GMC Sierra transmission replacement costs between $2,650 and $2,900, and that’s just for the transmission itself. When you factor in the cost of labor, you can expect to pay $3,600 or more for a full transmission replacement.
In some cases, that number may be even higher—Kelley Blue Book, for example, estimates the cost of a 2014 GMC Sierra transmission replacement closer to $5,300.
Why is it so expensive? For one, transmission replacements are an involved process that requires technical expertise and lots of time to complete. But in some cases, a transmission rebuild can be a cheaper solution, as rebuilding your transmission costs less than paying for a brand-new one.