[2000CAYukon]

I am not a fan of the tranny flushes, especially when they don't replace the filter. Some chain service centers sell this service and they basically disconnect the tranny cooler lines and hook it up to a flush machine. The filter never gets replaced so in my book this is not good.

Your best bet is to drop the pan, replace the filter and install a drain plug if you don't already have one (this makes it so much easier to drain the fluid). Most parts stores sell a tranny drain plug.

Install the new filter, replace the pan (with drain plug installed), refill the tranny and start the engine. Top off when the tranny is warm to proper level. At this point, if you really want to replace more fluid, drain (using the drain plug) and refill. This will replace most of the fluid and in my opinion is a better way to go.

//2000CAYukon