4R100 Transmission To Flush or Not - Ford Powerstroke Diesel Forum
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Old 10-16-2013, 05:42 PM
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4R100 Transmission To Flush or Not

I have 2000 7.3 with 190K I am hearing some conflicting information. The trans has been total neglected as far as maint. goes I would like to change that, should I flush the tranny or just drop the pan, replace the filter and 8 quarts of Mercon V.
I would feel better about flushing all of the old fluid out but at the same time do not want to some irreversible damage.
Everything in the truck is stock.
Sound advice would be greatly appreciated.
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Old 10-16-2013, 07:47 PM
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Quote:
Originally Posted by cokerta View Post
I have 2000 7.3 with 190K I am hearing some conflicting information. The trans has been total neglected as far as maint. goes I would like to change that, should I flush the tranny or just drop the pan, replace the filter and 8 quarts of Mercon V.
I would feel better about flushing all of the old fluid out but at the same time do not want to some irreversible damage.
Everything in the truck is stock.
Sound advice would be greatly appreciated.
Has the trans ever been serviced? If not, don't touch it and start saving for a rebuild. If its been serviced once maybe twice, just to 8qts and filter.

If a trans had been well taken care of then its just opinion on a complete flush or the 8qts n filter. I never do a flush anymore on my truck per BTS.

My cars I will though.

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Old 10-16-2013, 08:46 PM
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I've always understood that you don't want to do a flush if the trans hasn't been getting them regularly. Or if it's over 100.000 miles.... Or it's the best thing you could ever do to a transmission..... I can never get a similar answer from anyone so I don't think I'll ever get one done. I agree with Corey, just service it.
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Old 10-16-2013, 10:51 PM
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i need to do this as well.
i thought we werent supposed to use mercon V?

if using convential ATF what are we supposed to put in?
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Old 10-16-2013, 10:58 PM
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I thought we were supposed to use mercon v....
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Old 10-16-2013, 11:40 PM
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well apparently originally ford said mercon V was not to be used in these transmissions.

then all of the sudden in like 07-08 they said it was ok.
i cant rememeber exactly ill do some searching
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Old 10-17-2013, 04:26 AM
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Hmm yeah lemme know. I'll probably be doing my trans soon also once I find out.. I might call Ford today and talk to a diesel tech about it

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Old 10-17-2013, 06:07 AM
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I flushed mine last year. Mercon V
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Old 10-17-2013, 06:30 AM
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If you pull the return line from the cooler and dump in into a bucket, start the truck and let it pump it through. Let it pump a few quarts, shut off. Then top off and do it again until you've replaced the 19-20 qts. Works well, Google E4OD trans flush, theres a good write up on it.
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Old 10-17-2013, 06:34 AM
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Quote:
Originally Posted by Gaius View Post
If you pull the return line from the cooler and dump in into a bucket, start the truck and let it pump it through. Let it pump a few quarts, shut off. Then top off and do it again until you've replaced the 19-20 qts. Works well, Google E4OD trans flush, theres a good write up on it.
That's what I would do but I wouldn't do a pressurized flush

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