Hi,
For those of us who are out of warranty and a glutton for punishment, I'd like to gather information about doing a DIY replacement of the CDF drum in the 10R140 transmission. If you've done the replacement, or have helpful resources for anyone who might try to do it on their own, please share below. I realize it's a big job that most people would rather pay someone else to do, but there are a few of us crazy enough to try, so humor me.

For those not familiar, there's a bushing in the cdf drum of the earlier model 10R140 transmissions that can work itself out of place and cause shifting issues. Supposedly, the issue was fixed after August 21, but I've heard conflicting information and someone even mentioned they know people with 2024s that had the issue. The specifics of how many transmissions have had or will have the issue, and whether you should be worried about it, should be discussed in a separate thread. Let's try to keep this one focused on the specifics of the repair.


Here's what I'd like to hear about from anyone who has direct experience. Any transmission techs willing to give up your secrets?

1. Is there any reliable way to determine that your cdf drum bushing has moved before pulling apart the transmission?
2. When the cdf drum bushing goes, what sort of other damage can occur to the transmission? I've heard of clutches being damaged due to slipping, and damage to the sealing rings that ride inside the bushing. What could get damaged that would warrant replacing the transmission instead of fixing it?
3. What parts should always be replaced while the transmission is apart. CDF Drum, obviously, sealing rings that go inside the bushing, what else?
4. Latest part numbers for the cdf drum assembly? Recommended suppliers? Go with the Ford part or aftermarket?
5. Is there anywhere that we can find a full parts breakdown of the transmission for the purpose of finding part numbers?
6. General transmission removal steps would be helpful. Any time saving tips?
7. General steps for taking the transmission apart to get to the cdf drum and any tips for the average shad tree mechanic that might not have a full shop.
8. What sort of things should we watch out for when disassembling or reassembling the transmission?
9. What sort of special tools are needed?
10. Necessary supplies: Trans fluid, RTV, etc?
11. Links to any helpful information

Thanks for keeping this on topic.

I'll try to edit this post with helpful information.
TSB-23-2160 contains relevant information about the CDF drum failures for 2020 MY trucks. Part numbers for the drum and other parts that should be replaced are included. Thanks Stinson1

 

I have Dec built 20, it works fine... for now.
Hard to keep on topic... sorry.

Reality is unless you're fully versed in automatic transmission overhaul, take it to the pro's.
Way too many other items that need to be looked at and assessed.

Safer alternative is buy a new truck.

Best of luck if you decide to take this on.

 

If...errr when my cdf drum bushing shifts, I'll be getting a stage 2 Suncoast 10r140 and converter and putting it in. I'll let Suncoast handle my teardown.

 

https://www.tsbsearch.com/Ford/23-2160

 

Ummm that only covers 2020s. What about the 21-23s?

 

supposedly the CDF drum was updated partway through the 2022 model year.

 

Some on this board claim their 23's exhibit the same symptoms as the early cdf bushing slip. Ford is on their documented 3rd revision. Are you saying the 23 owners are lieing, that they are making it up or its all in their head? It could be true, the 23 owners could be lying about the 23' trans just to make it up. I'm doubtful that is the case. The CDF drum failure exists through 23'. MY.

 

I've created a new thread for discussing the CDF Drum failures. Just trying to keep this one on topic as much as possible. Thanks.

 

Thanks. Adding the link to the top.

 

If you have issues with your trans and Ford isn't helping you are better off reporting it to the NHTSA. That's how the 10R80 got recalled. The 23MY has updates. What those are is a mystery but it does have updates. No one ever checks the fluid level not even techs but being 2 quarts low or high can cause erratic shifting. Some people claim they have symptoms and need a new trans and all they really need to do is verify fluid level or stop driving like a teenager who just got their license. For everyone else with real issues they are better off mass reporting to the NHTSA and wait for a recall.

 

Does anyone have concrete build date for the CDF bushing fix? If so, link please. I have seen mid 21 and mid 22 reported. Both reports had zero documentation to support the claim.