[Mark42]

I hear people say all the time not to "flush" trans oil in a high mileage trans because it "stirs up all the gunk".

That is total BS.

If you ever watched a "flush" it is as far from a flushing as you can be. Its more like a forced drain. The tool fills the trans as the old oil is drained. Not a high flow or violent event my any stretch of the imagination.

I go to the local shop and they have been flushing the transmissions in my 97 Mountaineer, and 98 Town Car every 60K miles or so. The cars have 250K and 180K on them respectively. No trans issues AT ALL.

So go right ahead and have the trans flushed, but get the filter changed too. They should do that before doing the "flush". Remember, there is more oil in the trans and converter than is in the pan. So dumping the pan does less than half the job.

JS Performance has a very good reputation, and will do the job right, and give you the correct advice about the filter for your specific situation.