boostededge

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

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.

Theres a vent for a reason? I'm no Ford engineer though.

Awesome info Samurai Edge. Not a lot of info out there because no one probably does it themselves! Great write-up. If I ever buy one I will use this.

This thread makes me want to go change my RDU fluid again just for the heck of it 😅

Yea for $75-100 I'd order a set to try. But not for $300. When things are overpriced no one will buy it ($1500 downpipes, $12-1500 exhaust things like that). Crazy.

Also interested. The video they posted makes it look like the diff moves around a few inches during WOT.

Thought the same dang thing

I'm sure everything is fine. Most people don't even read the FSM, don't know about the full +1L and just do a drain and fill. Smoothness on decel is one thing I've noticed as well. I also had a slight vibration at idle depending on what RPM the vehicle was idling at. That appears to have gone away now or is deceased after the drain/fill/+1L.

Great info!

I think the 2022 FSM is a little more updated. The difference between the 5L and the 6L would be if the transmission was overhauled or if its just a drain/refill. If you added 6L at this step and the transmission was not overhauled I think its fine, there would just be more fluid draining out when you pull the leveling plug. Also if it was overhauled it still might be low when you pull the leveling plug so they have you add .25L at a time until it flows down the case correctly. From the 2022 FSM: 1. Transmission overhaul (includes main control and torque converter drain) Volume : 6.34 qt (6 L) 2. Main control overhaul or replace (with out transmission overhaul) Volume : 5.28 qt (5 L) So for the fill I put in 5L, got TFT up to 185 on jack stands, then pulled the leveling plug. The fluid looked like this: I let it drain right until it looked like this and then I installed the leveling plug: Then I buttoned everything back up and put in another 1L of fluid in as both the 2019 and 2022 FSM say to do. If you did not add that 1L, yours is underfilled. I put about 5K miles on the car since this flush and it shifts great. No weird shifts on the highway, no hunting for gears. It changes gears as it should. I also have Livernois updated tune but the tranny feels pretty good.

They still show for me. https://i.ibb.co/nqz2chYt/PXL-20250410-182114947.jpg https://i.ibb.co/V0WGVyJP/PXL-20250410-192117856.jpg https://i.ibb.co/qYxTJ5t9/PXL-20250410-192239964.jpg https://i.ibb.co/603hHsSw/PXL-20250410-192305765.jpg https://i.ibb.co/k6WB0c95/PXL-20250410-193054966-MP.jpg https://i.ibb.co/mVyqJ0hB/PXL-20250410-200603818.jpg https://i.ibb.co/DHJDLQj3/PXL-20250410-204657626.jpg https://i.ibb.co/847d6NLW/PXL-20250410-193705384.jpg

I went with the Amsoil SVG 75w85 in the PTU. The guys on Bobistheoilguy said the 85w would run ever so slightly cooler than a 75w90. And it makes sense to put a better than factory fluid back in. Theres a big Gear Oil Test thread where they test all the popular 75w90 gear oils on the market and the Amsoil came out on top of everything for the most part. Flash point, 4-ball wear, etc.

Keep in mind the ST is "full +1 quart".

Get the Bilsteins. The front left should be in stock soon or Summit may even have a couple. The front right is usually in stock. Rears always in stock.