Compatible trans fluid
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More Turbo
Joined: Mar 2022
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Compatible trans fluid
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?
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?
Lead Driver
Joined: Nov 2005
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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 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.
Last edited by Ltngdrvr; Feb 1, 2026 at 03:32 PM.
5th Wheeling
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Laughing Gas
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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
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Laughing Gas
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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... 
Laughing Gas
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Bob
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