Transmission Fluid type?
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5th Wheeling
Joined: Dec 2021
Posts: 34
Likes: 2
Transmission Fluid type?
Rehabbing a 91 E350 7.5l. I just replaced the radiator, and am looking to top off some transmission fluid lost in that process.
I have the factory specs from ALLDATADIY, and that says type F. However when I search with the vehicle specs all the auto parts stores are showing Mercon V and the like.
Ive read that these two really aren't compatible, and I've also read that Ford stopped using Type F in the early 80s.
So with all this conflicting info I'm not sure what to do next, any ideas? Thanks!
I have the factory specs from ALLDATADIY, and that says type F. However when I search with the vehicle specs all the auto parts stores are showing Mercon V and the like.
Ive read that these two really aren't compatible, and I've also read that Ford stopped using Type F in the early 80s.
So with all this conflicting info I'm not sure what to do next, any ideas? Thanks!
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,714
Likes: 2,639
From: SE Florida
That isn't MERCON. It's DEX/MERC.
Does it meet the now obsolete MERCON specification? I don't know, it won't say that anywhere on the bottle. If you trust that Valvoline is producing a fluid that meets the spec, then it's fine. If they are putting profits ahead of their customers, then it isn't fine. I don't know what to tell you.
Does it meet the now obsolete MERCON specification? I don't know, it won't say that anywhere on the bottle. If you trust that Valvoline is producing a fluid that meets the spec, then it's fine. If they are putting profits ahead of their customers, then it isn't fine. I don't know what to tell you.
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5th Wheeling
Joined: Dec 2021
Posts: 34
Likes: 2
I appreciate that point, gamble at my own risk, duly noted.
Separate but related question;
I haven't found a drain plug anywhere, assuming draining and replacing fluid means taking off the pan?
Could I instead disconnect the feed hose to the transmission oil cooler and add new fluid as the pump drains the system?
Separate but related question;
I haven't found a drain plug anywhere, assuming draining and replacing fluid means taking off the pan?
Could I instead disconnect the feed hose to the transmission oil cooler and add new fluid as the pump drains the system?
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,714
Likes: 2,639
From: SE Florida
Here is step by step how to change the ATF: https://www.ford-trucks.com/articles...-transmission/
Fleet Owner
Joined: Aug 2010
Posts: 21,253
Likes: 1,656
From: Reynoldsburg, Ohio
Here is step by step how to change the ATF: https://www.ford-trucks.com/articles...-transmission/
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5th Wheeling
Joined: Dec 2021
Posts: 34
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Mark, thank you for taking the time to write all that out for everyone to use, super awesome!
I've replaced the missing fluid, and am planning to replace the transmission filter and gasket this winter while this thing is in storage. I will bookmark this instructional for then.
Id like to add an aftermarket transmission temp sensor/gauge, any recommendations?
I've replaced the missing fluid, and am planning to replace the transmission filter and gasket this winter while this thing is in storage. I will bookmark this instructional for then.
Id like to add an aftermarket transmission temp sensor/gauge, any recommendations?
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,714
Likes: 2,639
From: SE Florida
MERCON V is not the same as DEXRON, but some fluids are approved for both fluids.
According to Valvoline's website (https://www.valvoline.com/en-th/maxlife-atf/) is approved for MERCON V and DEXRON.
According to Valvoline's website (https://www.valvoline.com/en-th/maxlife-atf/) is approved for MERCON V and DEXRON.
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