Unfortunately, replacing the transmission in any car, let alone a truck, is never a cheap service—expect your GMC Sierra transmission replacement to cost anywhere from $5,350 to $5,750, although the exact price will largely depend on the model year, submodel, cab-size, and truck style.
In general, however, you can expect a GMC Sierra transmission replacement to fall within the aforementioned range—so let’s break down what it is you’ll actually be paying for, namely the parts and labor.
The parts associated with replacing a GMC Sierra’s transmission cost between $3,950 and $4,250, or approximately 74% of the total cost—this is, more or less, average for light-duty trucks, if not slightly below average.
Labor, on the other hand, costs between $1,400 and $1,500—a high price to be sure, but deservedly so, as replacing a truck’s transmission is an incredibly involved process and may take anywhere from 1 to 4 days.
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