WakeZone
Member
Personally, I like the transmission flushing machines. I'm at 197k on '03 5.4L and have had 2 flushes done, they run around $100. When you factor in cost of fluid, filter, gasket, gasket maker, time, Go-jo, paper towels and cat litter, a flush doesn't cost much more. The machine replaces the full 13.4 quarts whereas a drain and fill will get what, 1/2 to 3/4 of the dirty stuff out? The flushing machine taps into the system just before the trans cooler so as the trans pump sends old oil to the cooler, it's collected and new fluid is pumped in at the same rate. You can watch old coming out and new going in, it's pretty cool. Only disadvantage is the filter "screen" stays in but in a properly running trans, it will only hold initial wear shavings and will not restrict flow. Been very happy with trans flushes and my driveway is spotless.