Making the world better, one answer at a time. The time it takes to replace a tie rod in a Buick varies with the age of the vehicle and whether this is an inner or outer tie rod. Estimated replacement time is 1 to 3 hours with a cost of about 230 dollars depending on the area and model.t is recommended to replace tie rods in pairs to keep  both sides wear equal. Replacing a single outer tie rods may be .75  hours of labor. An OEM outer tie rod may cost upwards of 40$ at  cash wholesale cost. Lastly, the vehicle will require an alignment  after installing tie rods, so factor additional cost.