Most manufacturers recommend servicing an automatic transmission every 25,000 miles. We do this by removing the transmission pan and replacing the filter, gasket, and fluid. This procedure allows the technician to see if your transmission has any wear and tear. However, there are some foreign and domestic cars that you cannot replace the filter. (Contact us to find out which one you have.) If you have a standard transmission, it is also recommended that you have the fluid changed every 30,000 miles. When you own a four-wheel drive vehicle, it is recommended that you service the transfer case every 25,000 miles. The rear differential should be checked at 25,000 miles and serviced at 50,000 miles.