[Cobrajet67]

The rubber on mine is shot, only 10K original miles. Anyone ever replace this on the stock driveshaft (auto trans)?
Does not seem available and even entire DS does not seem available from Ford.

There's many parts shortages going on. Failure at only 10k miles is strange. Perhaps it was a factory defect. You can have your driveshaft taken to a driveline shop to have them fix it. They can replace the carrier. It'll be cheaper than any new Ford or aftermarket driveshaft will be.

 

[Cobrajet67]

The Carrier bearing and rubber much like the F150 are not serviceable so unless you want to go backwards (previous version is available on FPG) I would just go with the aftermarket aluminum.

I've heard this is generally true as well insofar as buying a carrier bearing replacement off the shelf anyway. However, most driveline/driveshaft service companies do unusual repairs and custom work all the time and can even make driveshafts from scratch. They also have parts available to them from their unique industry that the average person doesn't. Imo there's a good chance that a capable shop could replace the bearing. It doesn't hurt to make a few calls to a local shop or two or a shop such as this: Center Support Bearings - Inland Empire Driveline (iedls.com)
Custom Driveshafts – Inland Empire Driveline (iedls.com)
or this one:
Driveshaft Repair and Service – Action Machine Inc

 

[Cobrajet67]

Last person I sent to the driveshaft shop had the driveshaft shop tell me not send anymore there, as he puts it count the pieces between the end universals and that is how many pieces are in the shaft. 1 piece will not work on our cars since it has flanges.
I told someone where to go to get a shaft made, he proceeded to tell them he wanted a 1 piece shaft for his 2012 Mustang V6. He ended up waiting 4 or 5 weeks for AM to get them back in since the driveshaft shop I sent him to was just going to build him another 2 piece shaft. So I am the badguy.
OX1 did say he marked all 3 so there might be some sanity left.
That Rubber is definitely bad OX1, like this one

Some shops are just more willing or capable than others I suppose. Though that really applies to any kind of shop in automotive service. Theoretically, all it takes to replace that bearing assembly is another of the same diameter and a similar bracket design/dimension that will or can be made to bolt up to the factory mounting holes.
LMR and AM sell many so called "1 piece" shafts for the 2011-14 GT even a Ford Performance one. Technically they're just a more simplified 2 piece. They just delete the need for a carrier bearing and put the telescoping portion near the end instead of near the middle. There are benefits to a conventional 2 piece shaft that use a carrier bearing assuming that the bearing is made well enough to hold up that is. It would seem that the factory Ford bearing was budget engineered a little too much though.
Here's a couple of pics of the factory shaft and the Ford Performance shaft:

 

[Cobrajet67]

I just watched your video and the amount of play is crazy for only a 10k mile car. The rubber "bushing" that Ford installed really looks like it was designed to fail. There's so little rubber and so many spaces in it that you could never expect it to last for long. It's also quite narrow for the overly lightweight design that it is.

And I guess I painted the yellow dot on diff flange, but it looks like mine was aligned correct from the factory.
Digging around it seems like many were not, even into the S550 cars.

You've heard that there were driveshafts that weren't aligned form the factory?

 

[Cobrajet67]

I didn't realize that you were from Jersey too. That's some impressive work that you did there. That looks like it might actually be an almost permanent fix if it turns out to be vibration free. I watched the video and it seems that there's now only a very tiny bit of flex when you pushed down on the bushing. You can barely see it and it looks like it's the right amount that probably should have been designed into the car originally but to last.

The thread with the vibration issues had 252 pages! That's crazy how many people responded to it. I got thru the 1st page lol. This almost seems like class action lawsuit material if these 2 piece driveshafts were under engineered. Just on that 1st page I read that people were saying how their car vibrated even when brand new... This appears to be budget engineering at its worst.

 

[Cobrajet67]

Glad to hear that the fix to the stock carrier actually worked. The work that you did was innovative and it's awesome that it cured the vibration. What a terrible position Ford has left Mustang owners in by making such a bad factory design that can't be normally serviced. At least someone else that finds themselves in your position can use the step by step process that you outlined to fix their vibration issue too.
Being that you spent so much $ on the aftermarket driveshaft I would probably put it in and just save the stock repaired one just in case you get some kind of a failure with the new one.

 

[Cobrajet67]

For those interested in a bolt-on fix, that doesn't require DS removal or welding. There's this ... It's a little pricey but I'd rather go this route.

Ford S197 Mustang Driveshaft Center Support Bearing Carrier Upgrade — JXB Performance

Performance driveshaft carrier upgrade keeps your driveshaft perfectly aligned, reduces drivetrain slop, and doesn't sag or crack over time. 2-piece design doesn't require removal of the driveshaft and installs easily without any special tools.

www.jxbperformance.com

Awesome find! That's a wonderful new product to have available. This now means people don't have to discard their stock driveshafts and take the risk on a new aftermarket one or have to modify the carrier bearing bushing and mount to stop vibration.
This thread is still very useful for anyone that might want to save the $250 and do it themselves like OX1 successfully did.

 

[Cobrajet67]

So is the factory carrier not available anymore? What's the deal with this $250 one? My car has 105k on the clock now and the 11 year old carrier bearing is still great as far as I can tell. If/when it ever fails I'd likely just slap another OE one in there. Unless OE isn't available anymore, or OE actually cost more than this aftermarket option.

You clearly didn't read thru this discussion. There is no OEM replacement.