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Did trans fluid/filter and PPE pan install and took a couple photos of the inside condition. Was looking at photos afterwards and noticed what appears to be a crack in the cast internal part of the case right behind the valve body.
Wondering if anyone else has seen this on their 10R140.
I am not getting any kind of extreme crazy trans issues or anything (just all the typical 10R140 problems) but this just doesn’t look right to me. Wish I would have noticed when the pan was off so I could have inspected more closely. From what I can see in the photos, it doesn’t look like a normal casting type parting line but hard to tell. Either way it’s extremely concerning. 2022 F250 diesel and truck is at just under 52k.
Last edited by bsconz; Nov 4, 2025 at 07:51 PM.
Reason: Insert photos
I’m going to Ford dealer to show them the photos and get warranty claim going.
I’ve read all about the known issues with 10R140’s. Definitely have experienced generally weird/erratic/unpredictable shifting, harsh downshifts through 4/5/6 gears, clunk shifting into Reverse from Drive or into Drive from Reverse, and sometimes feels like clutches are slipping more than they should around 4th gear.
Also notice continuous clicking sound after coming to a stop in gear/foot on brake. Kind of like a one way clutch type clicking.
Stopped into Ford dealership. Service Advisor took my photo and showed to a master tech at my request. Tech had her take a photo of a similar parting line defect on a different trans case he had open. They admitted that what I showed them looked far worse but that if it were a crack through the case the trans would be exhibiting major issues.
She also talked to the Service Manager who advised that if they took the truck in to inspect, Ford would likely deny any warranty claim without drivability issues and that I’d be responsible for the inspection labor.
So overall they didn’t think this was an issue. I had them enter in that we talked about this for documentation purposes. Truck is at 52k now so 8k more before Powertrain warranty is up.
Guess I’ll have to keep a close eye on things..maybe think about and plan for aftermarket built 10R140 if it grenades itself right at 60,001 miles!!!
Try contacting FoMoCo directly, and see what they say. The dealer is just spouting what they believe that Ford will state. Go directly to the source and eliminate all guesses.
Yeah from the first picture I thought it was just a casting parting line.
Second picture DEFINITELY looks like a nasty crack.
Sadly if it isn't leaking or causing other driveability issues there's a strong chance Ford will say there's nothing wrong. But I certainly wouldn't like to see that.
Yeah for sure. Waiting for another local dealer 2nd opinion on the photos. During phone call they had a different idea on how they would handle this with Ford for warranty vs first dealer.
To be clear, I have experienced a range of the typical 10R140 issues so there’s definitely drivability issues. This was its first trans service at 51425 miles. This truck has only ever hauled a <10k lbs toy hauler on occasion (like 2-3 times per year for last 3 years) and the occasional dump run with my utility trailer…mostly just dirt bikes and to/from work. Easy life!
Will report back. Bare minimum I will be asking Ford to extend the warranty to 100k if they don’t want to swap it with a crack free transmission.
I know there’s also good options for aftermarket built 10R140’s (Next Gen, Rudy’s, etc.)…just expensive and I shouldn’t be having to do this on a truck that has been babied.
I'm not a transmission guy, but I would stop by a transmission shop and ask them what those rounded section of the casting do, are they a channel for transmission fluid?
I can see the dealership's point of view, they're the ones are actually stuck in the middle. Somebody has to pay for labor and supplies for an inspection.
At the end of the day, assuming that it is still under warranty, I would exercise the truck. I know that it goes against the way you have been taking care of the truck but if it is going to fail it might as well do it under warranty. If it fails outside of warranty you can’t even have it rebuilt.
I too baby my truck.when I brought it in to have the transmission checked they drove it 20ish miles and burned over 3/8 of a tank. Clearly they spent a lot of time at WOT and were hard on the truck. Being the guy who has never spun the tires it pissed me off. I get needing to due some WOT but really 3/8 of a tank of fuel in about 20 miles?
Agreed. I need to get it inspected, documented, and actual warranty claim started regardless of the immediate outcome.
I thought the same thing about confirming what that channel is for where the crack goes across and have been down the rabbit hole a bit further…
Here’s where I’m at now:
It’s definitely a parting line defect that has either opened up more than typical or was like that since manufacturing. I searched 10R140 case and found several photos showing the parting line in the exact same location…except none of those are cracked open…just visible slightly raised parting line feature. This photo is from an eBay listing. Circled around the parting line that goes through that channel.
The arrow points to a port in that channel that is normally fed by the valve body for clutch application. Not sure exactly which clutches yet but I found a good link to a Lincoln Aviator forum where they show some of the 10R60/10R80 diagnostic testing procedures which are likely very similar for the 10R140.
Basically with the valve body off you use a rubber tipped air nozzle to apply up to 40psi into these ports and see if you hear clutches applying or air leaking at the various seals.
All that is to say if the channel on the 10R140 actually is routing fluid from the valve body for clutch application, and there is a crack in that channel allowing fluid pressure loss, then this will adversely affect proper transmission operation and can most definitely cause the drivability issues I’ve experienced.
If this channel is for CDF clutches then it could explain the slipping feeling in 4th gear and be a contributor to other erratic shifting I’ve experienced in the 4th, 5th, and 6th gear range.
Plan is to bring truck into the dealer and have them inspect it. I am comfortable to do the air test myself too but no sense in taking the pan off twice. I can pay for the labor/materials if Ford denies the warranty but at least it will be documented.
My obvious concern is that while it may seem mostly fine now (and might even pass inspection tests) the crack could get worse or fully open up outside of warranty and cause major problems.
I have a borescope that I was going to use for continued monitoring and can probably use FORScan to look at transmission pressures, slip ratio, etc.
