A couple of weeks ago when it was really cold outside I was pulling out of my driveway and I heard a crunching noise which I thought was just ice but when I got to the corner I heard a pump whine for a couple of seconds and then the transmission crunched as it downshifted to first gear.

Today as I was pulling into a parking lot I hit the gas, the RPMs came up, the truck did not move for a couple of seconds and then bam, the transmission engaged. I'm guessing it's low on fluid which is odd because it's never been opened up and it's never leaked but I cannot find Motorcraft ulvf fluid in my area. Is anything else compatible?

 

Rock auto or your local dealer

 

MERCON ULV is a formulation, as such, any brand of MERCON ULV is compatible, doesn't have to be Motorcraft.
I used Valvoline MERCON ULV when I did the new pan on mine.
But, if your truck has no obvious signs of trans fluid leaks, then very likely some other issue.
I would check the level first before buying any fluid or adding any.

 

I had a similar issue happen to me on my 2020. ended up needing a transmission rebuild. Burnt clutches and drum bearing that went for a walk.

 

Anyone running Amsoil in their Super Duty transmissions?

Bob

 

If you have chatgpt it can pull up all the compatible fluids. You can review them from there.

I generally look at viscosity at 100c. I like to be on the high side.

 

10 speed?

 

The OP doesn’t specify so it makes it hard to answer their question. My question regarding the Amsoil was specifically referencing the 10R140.

Bob

 

Yes, I am... Also in the transfer case and diffs... Seems to have gained about 0.5 to 1.0MPG & makes it up hills usually 1 gear higher, meaning 9th instead of 8th and so on...

 

Always good to hear. I am a fan as well.

Bob