Davidoo Posted March 22 Report Share Posted March 22 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! 1 Quote Link to comment Share on other sites More sharing options...
STBEAST Posted March 22 Report Share Posted March 22 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. 2 Quote Link to comment Share on other sites More sharing options...
garycrist Posted March 22 Report Share Posted March 22 @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! 3 Quote Link to comment Share on other sites More sharing options...
STBEAST Posted March 22 Report Share Posted March 22 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. 1 Quote Link to comment Share on other sites More sharing options...
Davidoo Posted Saturday at 09:05 PM Author Report Share Posted Saturday at 09:05 PM 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? 1 Quote Link to comment Share on other sites More sharing options...
chr8990 Posted Sunday at 05:57 AM Report Share Posted Sunday at 05:57 AM (edited) 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 2 Quote Link to comment Share on other sites More sharing options...
chr8990 Posted Sunday at 06:01 AM Report Share Posted Sunday at 06:01 AM (edited) 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 1 Quote Link to comment Share on other sites More sharing options...
Davidoo Posted Sunday at 10:13 PM Author Report Share Posted Sunday at 10:13 PM So there are 3 separate drivetrain fluids......transmission, PTU, and RDU? Just want to verify that to see what I want to get changed. 2 1 Quote Link to comment Share on other sites More sharing options...
chr8990 Posted Sunday at 10:49 PM Report Share Posted Sunday at 10:49 PM 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 2 Quote Link to comment Share on other sites More sharing options...
STBEAST Posted Tuesday at 07:48 PM Report Share Posted Tuesday at 07:48 PM 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. 1 Quote Link to comment Share on other sites More sharing options...
chr8990 Posted Wednesday at 12:30 AM Report Share Posted Wednesday at 12:30 AM 4 hours ago, STBEAST said: 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. I’m not sure there’s actually any real difference between the PTU that the 2.0L trims have and the 2.7L. Maybe there is and I haven’t seen it but they seem to share the same part numbers on the assemblies. Here is one without the hot weather group (without cooler): https://ford.oempartsonline.com/oem-parts/ford-transfer-case-k2gz7251m Here is one with the hot weather group (with cooler): https://ford.oempartsonline.com/oem-parts/ford-transfer-case-k2gz7251e As you may notice, both of these fit the 2.0L and 2.7L. There are differences in the differentials though. 2.0 Diff: https://ford.oempartsonline.com/oem-parts/ford-differential-assembly-k2gz4000u?c=Zz1zdXNwZW5zaW9uJnM9YXhsZS1hbmQtZGlmZmVyZW50aWFsJmw9MSZuPVNlYXJjaCBSZXN1bHRzJmE9Zm9yZCZvPWVkZ2UmeT0yMDIyJnQ9dGl0YW5pdW0mZT0yLTBsLWw0LWdhcw%3D%3D 2.7 Diff: https://ford.oempartsonline.com/oem-parts/ford-differential-assembly-k2gz4000r?c=Zz1zdXNwZW5zaW9uJnM9YXhsZS1hbmQtZGlmZmVyZW50aWFsJmw9MSZuPVNlYXJjaCBSZXN1bHRzJmE9Zm9yZCZvPWVkZ2UmeT0yMDIyJnQ9c3QmZT0yLTdsLXY2LWdhcw%3D%3D Quote Link to comment Share on other sites More sharing options...
STBEAST Posted Wednesday at 02:05 AM Report Share Posted Wednesday at 02:05 AM (edited) This is from Ford: It applies to the 2022-2024 ST There are two different models of the PTU. The low torque PTU is paired with the 8F35, 8F40, and MMT6 transmissions. The high torque PTU is paired with the 8F57 transmission. The low torque and high torque PTUs are similar in design and operation. The ST has the 8F57 transmission Edited Wednesday at 02:06 AM by STBEAST Quote Link to comment Share on other sites More sharing options...
chr8990 Posted Wednesday at 03:52 AM Report Share Posted Wednesday at 03:52 AM 1 hour ago, STBEAST said: This is from Ford: It applies to the 2022-2024 ST There are two different models of the PTU. The low torque PTU is paired with the 8F35, 8F40, and MMT6 transmissions. The high torque PTU is paired with the 8F57 transmission. The low torque and high torque PTUs are similar in design and operation. The ST has the 8F57 transmission That sounds like it’s from the Workshop Manual or something. I don’t own that but, if so, that does make logical sense. It’s still curious to me that the parts website seems to list the same part for the 2.0 and 2.7 but it could very well be inaccurate. Quote Link to comment Share on other sites More sharing options...
STBEAST Posted Wednesday at 07:43 PM Report Share Posted Wednesday at 07:43 PM Here is some interesting information: A big thank you Haz for this! Power Transfer Unit - Description and Operation - 2.7L EcoBoost - 2022-2024 Edge Workshop Manual.pdf 2 Quote Link to comment Share on other sites More sharing options...
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