Buying a transmission is expensive and the transmission replacement cost can be quite pricey. Before you actually buy a transmission, check with online sites and several dealers to find out the lowest prices on the transmission. You will also need to find out the exact cost for your car model. Once you have the spare parts, check with each garage to find out the exact cost. The cost will range from $1,500-$3,500. The labor cost will also depend on the car model that you have and the work involved. You will get discounts at AAA service centers or at national franchise chains like AAMCO.