4r100 flush question

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Feb 25, 2017 | 09:34 PM

ocracokenc

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4r100 flush question

I am installing a 6.0 cooler from Riffraff and am I correct in thinking that when you drop the pan and add the six quarts of fluid and a new filter when you start the truck you will only flush the around 6 quarts of fluid that you just poured in and to flush more you just add more fluid? Do you do this until the fluid is clear?

I got 25 quarts of Ford Mercon V to get a good flush. I was wondering if when I unhook the line form the old cooler can I just flush using the existing 3/8" line connected to the hard line? I do not have a OTW cooler.

I am planning on replacing a few feet of new 3/8' line to add to the 1/2" line so to have all new rubber line. Thanks guys

Feb 25, 2017 | 10:01 PM

jwsrules

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Hi yeah u just unhook the return line and after you put pan back and add fluid that came out ftom pan drop, use return line to flush it run truck until fluid becomes better colour.

Feb 27, 2017 | 10:55 PM

ocracokenc

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Thats what I thought. I got 20 quarts of the Mercon V so I can give it a good flushing

Feb 28, 2017 | 08:13 AM

Mike189677

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Changing ATF Fluid in a E4OD and 4R100 transmission - Ford-Trucks.com

Mar 8, 2017 | 07:07 PM

ocracokenc

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I have been thinking about not dropping my pan and changing my filter since I have a drain plug. I only have 127,XXX miles. I have heard some people say that Ford does not recommend ever changing it. It would same some time for the 6.0 cooler install, Thoughts?

Mar 8, 2017 | 08:12 PM

Mark Kovalsky

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The filter doesn't need to be changed. If there is enough junk in the filter that it does need to be changed, the transmission has already failed.

Mar 9, 2017 | 05:36 PM

ocracokenc

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Thank you Mark, I have 20 quarts of Mercon V and will get to it this weekend. I wanted to get new 3/8" transmission line to replace the rubber line I will be connecting to with the 1/2" but I have decided to leave the factory line in place.

I have spent almost $3800 on my truck in the last few months and I am done. It is almost new again though lol.