4R100 Full Fluid Change
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5th Wheeling
Joined: Jan 2011
Posts: 33
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4R100 Full Fluid Change
Hi all -
I've read through flush threads involving disconnecting the trans cooler lines, but I stumbled across this video here on the forum and wanted to give it a try if there's no good reason it won't work. Seems like it'd be pretty effective at getting 95% of the fluid changed over pretty quickly and with minimal mess. If this works well, I would figure on full fluid replacement every few standard drain/refill services. Because of my intended intervals, I'm not super worried about the fluid left trapped in the cooler lines at the moment.
The video is for a 5R110, but I wanted to make sure I wasn't overlooking something as to why it wouldn't work on a 4R100.
Thoughts?
- Chris
I've read through flush threads involving disconnecting the trans cooler lines, but I stumbled across this video here on the forum and wanted to give it a try if there's no good reason it won't work. Seems like it'd be pretty effective at getting 95% of the fluid changed over pretty quickly and with minimal mess. If this works well, I would figure on full fluid replacement every few standard drain/refill services. Because of my intended intervals, I'm not super worried about the fluid left trapped in the cooler lines at the moment.
The video is for a 5R110, but I wanted to make sure I wasn't overlooking something as to why it wouldn't work on a 4R100.
Thoughts?
- Chris
Fleet Mechanic
Joined: Oct 2008
Posts: 1,321
Likes: 250
From: North Texas
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,722
Likes: 2,648
From: SE Florida
Hi all -
I've read through flush threads involving disconnecting the trans cooler lines, but I stumbled across this video here on the forum and wanted to give it a try if there's no good reason it won't work. Seems like it'd be pretty effective at getting 95% of the fluid changed over pretty quickly and with minimal mess. If this works well, I would figure on full fluid replacement every few standard drain/refill services. Because of my intended intervals, I'm not super worried about the fluid left trapped in the cooler lines at the moment.
The video is for a 5R110, but I wanted to make sure I wasn't overlooking something as to why it wouldn't work on a 4R100.
Thoughts?
- Chris
I've read through flush threads involving disconnecting the trans cooler lines, but I stumbled across this video here on the forum and wanted to give it a try if there's no good reason it won't work. Seems like it'd be pretty effective at getting 95% of the fluid changed over pretty quickly and with minimal mess. If this works well, I would figure on full fluid replacement every few standard drain/refill services. Because of my intended intervals, I'm not super worried about the fluid left trapped in the cooler lines at the moment.
The video is for a 5R110, but I wanted to make sure I wasn't overlooking something as to why it wouldn't work on a 4R100.
Thoughts?
- Chris
https://www.ford-trucks.com/articles...-transmission/
Thread Starter
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5th Wheeling
Joined: Jan 2011
Posts: 33
Likes: 1
It should work on a 4R100. The pump intake is a different size so you'll need to adjust for that. And this will change the fluid in the cooler lines, too. But I think this one is easier for a 4R100:
https://www.ford-trucks.com/articles...-transmission/
https://www.ford-trucks.com/articles...-transmission/
In the readings I've done here on the forum, your advice is generally regarded as gospel. Thank you for taking the time to respond to my question.
I saw your method posted elsewhere, but did not see it in comparison to the method that I posted above. If it's your opinion that the method you linked is faster/easier/less messy/better and is the way to go, then that's the method I'll use.
Much thanks.
- Chris
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,722
Likes: 2,648
From: SE Florida
The 5R110W method is nothing short of brilliant. It gets around the problem of the thermostat that is in the 5R110W. But the 4R100 does not have a thermostat. So just opening a cooler line will get as much fluid changed as the other method. Either one will change around 95% of the fluid, so it's your choice. I think the older method is just easier to do.
Thread Starter
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5th Wheeling
Joined: Jan 2011
Posts: 33
Likes: 1
The 5R110W method is nothing short of brilliant. It gets around the problem of the thermostat that is in the 5R110W. But the 4R100 does not have a thermostat. So just opening a cooler line will get as much fluid changed as the other method. Either one will change around 95% of the fluid, so it's your choice. I think the older method is just easier to do.
I got the fluid flushed using your method yesterday. Didn't make too much of a mess hooking everything back up when I was done. Thank you for your help!
I did have a question though - since the original recommended interval was 30K, but now we're using Mercon V instead of Mercon - does that change the recommended fluid drain and refill interval?
Thanks
- Chris
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