6.4 automatic tranny...when to change fluid

[ThirdCoastStroker]

what is the recommended mileage to do a transmission flush...and what is the recommended fluid to use?

[macgyvr]

My F450 says 60k.

I dont have the fluid memorized

mac 'flushed' gyvr

[AW794]

Originally Posted by THE SILVER BULLET

what is the recommended mileage to do a transmission flush...and what is the recommended fluid to use?

I believe its 60k and the fluid is mercon SP. Its all in your owners manual.

[tbsimmons]

Mercon SP
I am not a big believer of leaving the stock fluid in the tranny, diffs, engine, etc. for very long.
My engine oil was first changed at 800, diffs not too long after.
The tranny I waited longer than normal, 15,000.
If you have beat on your truck, towed, etc. you will be shocked of the buildup on the magnet and the color of the filter. Mine had some, not more than normal break in stuff, but glad I didnt wait to what Ford says.

[sinner6.0L]

30k is a good rule of thumb. change the external filter also