Advice on PTU, Differential, Transmission fluid change on ST

[Davidoo]

I have a 22ST nearing 30,000 miles.  I've seen several different posts in the past about changing these fluids, but are a bit confusing to me.  

 

Are there 3 different parts that need the fluid changed.  I've seen PTU, rear differential, but I assume there is also a regular transmission that needs it too?  I know some have changed their own, but I don't really have a way to lift the vehicle level and just don't feel like doing it myself.  Will probably go to the dealer as I have a bunch of Fordpass points.  What am I looking at as far as cost, and should all 3 be changed around 30k miles?  Thanks!

[STBEAST]

From what I know is you definitely want the PTU and RDU fluid changed. I would make sure that the dealership actually knows what you are trying to get serviced. Seems like some of them are in the dark on the PTU fluid change as it is not listed as a routine service. I think the transmission could be at a later time interval but not sure. I too would like more info on this as I will be taking mine to the dealer when the time comes for me.

[garycrist]

@Davidoo, I also have a 22 ST too. As you stated confusion exists but I will help you.

Our RDUs have a drain plug and a fill plug and the tranny has a drain and fill plug too.

AS for no lift, I used 4 ramps https://www.amazon.com/RhinoGear-11912-RhinoRamps-Vehicle-Ramps/dp/B0117EESNC/ref=sr_1_4?crid=R9MRLD01WYW4&dib=eyJ2IjoiMSJ9.4okd22uK9UE4fyiUUj08Slo6FXaiQHl7CDfDtOe6sUfcGRBJAgsX8MqPngrm9kJj4_3k1CFA6Tj8lj_S6e8kSUuSTfKfL3gifNAavPsy5QjQ8d7glVtjxGhLRXcCP5xovssfsIUDvyJ4RNRBKRRV7a7v0DqBTpW18rGk--538kcq-1PGrilqWVhHZfyIYVigRFrCLV_D8o756fLxqh10yHiJWildoqkhEio7Lu-oe1u3RCq-jffBN70GoWrpAU-YpLRZ3mWX2xMWnG01UCtJdanexSTKHq_awTxbnnfHug7tSZt43yLO8t8X8Ox5CDqcKOvO3NIVLqVk2cWpT9jm35ooQ3sB5zbEurysBH27zblI8fy18LW8xriFy3MuRQUnoUYKv5_n5Y_OVCdb9bA4TuXlUaXChZ9w9mkW_Dcj7k6KTmg84ncSQ3S2RLWiyFHr.ey3DhlG06_05QhLU4ioQXHO0ZfYSV2WxTZ0qQ3m43Lg&dib_tag=se&keywords=drive%2Bup%2Bramps&qid=1742655930&sprefix=drive%2Bup%2Bramps%2Caps%2C155&sr=8-4&th=1 to do all my service on a creeper

to boot!

[STBEAST]

garycrist. do you have a recommendation on what fluids to use in the PTU and RDU? I know they each use a different fluid and there are some good choices including the OEM. I have heard about Redline shockproof for the PTU and not sure about the RDU. Thanks for any feedback.  

[Davidoo]

6 hours ago, garycrist said:

@Davidoo, I also have a 22 ST too. As you stated confusion exists but I will help you.

Our RDUs have a drain plug and a fill plug and the tranny has a drain and fill plug too.

AS for no lift, I used 4 ramps https://www.amazon.com/RhinoGear-11912-RhinoRamps-Vehicle-Ramps/dp/B0117EESNC/ref=sr_1_4?crid=R9MRLD01WYW4&dib=eyJ2IjoiMSJ9.4okd22uK9UE4fyiUUj08Slo6FXaiQHl7CDfDtOe6sUfcGRBJAgsX8MqPngrm9kJj4_3k1CFA6Tj8lj_S6e8kSUuSTfKfL3gifNAavPsy5QjQ8d7glVtjxGhLRXcCP5xovssfsIUDvyJ4RNRBKRRV7a7v0DqBTpW18rGk--538kcq-1PGrilqWVhHZfyIYVigRFrCLV_D8o756fLxqh10yHiJWildoqkhEio7Lu-oe1u3RCq-jffBN70GoWrpAU-YpLRZ3mWX2xMWnG01UCtJdanexSTKHq_awTxbnnfHug7tSZt43yLO8t8X8Ox5CDqcKOvO3NIVLqVk2cWpT9jm35ooQ3sB5zbEurysBH27zblI8fy18LW8xriFy3MuRQUnoUYKv5_n5Y_OVCdb9bA4TuXlUaXChZ9w9mkW_Dcj7k6KTmg84ncSQ3S2RLWiyFHr.ey3DhlG06_05QhLU4ioQXHO0ZfYSV2WxTZ0qQ3m43Lg&dib_tag=se&keywords=drive%2Bup%2Bramps&qid=1742655930&sprefix=drive%2Bup%2Bramps%2Caps%2C155&sr=8-4&th=1 to do all my service on a creeper

to boot!

 

 

Thanks Gary, I thought about 4 ramps and those look nice. Just not sure as I do have a ton of Ford points, and not feeling like I want to do it.  

 

What about the transmission?  Is that not a concern as much as the PTU and RDU?

[chr8990]

For what it’s worth, I have a 2022 Edge ST and the documentation the Ford techs use when servicing the PTU and RDU. Inside of it, you will see all of the parts required as well as the OEM fluids.

 

It could be a little dependent on year and perhaps even packages selected on the build (400a vs 401a) but mine has a cooler attached to the PTU.

2022 Edge ST Rear Differential Fluid Change.pdf 2022 Edge ST PTU Fluid Change.pdf

Edited Sunday at 06:06 AM by chr8990

[chr8990]

I did go ahead and flush the transmission fluid on mine at 30K, as that also services the front differential, but probably not as big of a concern as the PTU. I always do the transmission fluid every 30K on all of my vehicles I actually care about though.

Edited Sunday at 06:05 AM by chr8990

[Davidoo]

So there are 3 separate drivetrain fluids......transmission, PTU, and RDU?  Just want to verify that to see what I want to get changed.

[chr8990]

33 minutes ago, Davidoo said:

So there are 3 separate drivetrain fluids......transmission, PTU, and RDU?  Just want to verify that to see what I want to get changed.

Correct

[STBEAST]

Thank you chr8990 for the pdf on the ptu/rdu.

I believe the ST's use a high torque ptu ?

Other than a cooler there must be some stronger internal components.