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Thermal expansion would make the "what comes out must go in" ATF swap challenging warm. Unless doing the level recheck procedure. 

I changed the PTU and he other week, used the Redline 75w85 GL-5.  No drain plug or cooler, so I drained it by removing the block off plate where the cooler should be.  It looked fairly clean but smelled real bad (even for gear oil).  I still need to do the RDU, have the Redline MT-LV 70W/75W GL-4 on the shelf waiting.   

And I am now on hold with this project.  My Edge is at the Ford dealership having  transmission problem repaired.  Made a post in the Ecoboost section about this if you are interested.   When I get it back, I am going to install the Axxess ANC bypass harness which is behind the touchscreen.  I am also going to install the dash storage bin with lid that I bought from Ford a couple of weeks ago.  Once that is done, I need to set the Accubass on the LOC and set the gains on it and the amp.  

Shortly after I got my Edge in May, I began to notice a thump, or jolt, when slowing down at 15 mph.  I decided to change the PTU and rear diff fluids since they needed to be done, and see if that would resolve the problem.  No dice.  Went on vacation in early June, and when I got back, I took it to my local Ford dealership to look at.  They heard the sound immediately on the test drive and stated they felt the transmission needed to come out to tear down and find the failure.  They had no loaner cars and told me they would call me when one came available.     Fast forward a couple weeks later and I haven’t heard anything.  I call the service advisor and she tells me she hasn’t forgotten about me and that they only have two loaners available for the entirety of the dealership service department to use.  So I wait, and continue to wait, just over two months until I decided I had enough of waiting.  I decide to call another dealership that I pass by on the way to work, albeit 30 minutes away.   I call the service department and explain the situation.  SA tells me they can’t go by what another dealership says and has to do their own diagnosis on it, to which I agreed and acknowledged.  I made an appointment for a weekday early morning and the SA and his transmission tech drive it and acknowledge the thump at 15 mph.  He says they want to pull the driveshaft and drive it and see if the noise remains or disappears.  They wanted two hours of time that I really didn’t have.  We got further into the conversation and he said he was short on loaners as well.  I told him I had to leave and needed to reach back out to him when I could figure out transportation.     I called the service department back Monday afternoon and told the service advisor that I needed a loaner and that I couldn’t find a vehicle to borrow.  He told me that he just had a loaner come available and I could bring my car in Tuesday and leave it and take the rental.  YES!!!  I got a brand new 2026 F150.  More importantly, my car is finally getting looked at and fixed.   They pulled the driveshaft and drove it.  The noise remained.  Next step, pull the valve body out of the trans and inspect it and air check the clutches for proper operation.  When they drove it, they had a scan tool hooked to it monitoring everything, which returned nothing to go off of.  They found an issue with the C clutch for third gear so now they have to tear down the transmission to find the failure.  This is Ford’s stance to warranty a powertrain part.       More to come.  Service advisor has acknowledged that this will be covered under the power train warranty so enjoy the new F150 while they get this fixed.  

I changed the PTU oil this afternoon, like the RDU it was a piece of cake. If you have a stubby 3/8" ratchet it will help to get the fill plug out but it's not necessary. The oil was a light pancake syrup color and smelled just like gear oil. I put Valvoline Advanced Pure Synthetic 75w-85 in and it was lighter than what came out but not by a lot. 

I typically drain fluids while they are very warm.  A 10 minute drive does the trick.

I performed a drain and fill this week. As I know the fluid is level from my last drain/fill/leveling I decided I should be able to get away with just a drain and fill.   Car was cold for 36hr.    Drained as much as I could get into my 1gal container without spilling a drop.   Put a tape mark on container to measure the volume and weighed it on the food scale to get an idea of mass. The same amount that came out, went back in. I might perform another drain/fill/level but wanted to try this method. Car did not move or change elevation for the process. 

I presume this is a used vehicle and not a brand new vehicle?   Haven't had it done but true.  Typically all the wiring is already done.  When you add " options ", many times there are done at the point of entry.  So, if you live in Cali, your new car goes to a Distribution Center.  They can add " options " before it leaves the Center.   If they can do it there, then it can be done somewhere else.

I thought the RDUs  were basically the same. With a coupler bolted to about a 7.5 inch differential. Please set me straight!