Change or Flush 4R100 - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 03-04-2017, 11:00 AM Thread Starter
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Change or Flush 4R100

I am sure this has been asked many times. I have a Suncoast 4R100 tranny in my truck and has 230,000 miles on it. The fluid smells and looks fine but I like to keep up on my stuff as best as I can. I called Suncoast and they said to run just good O Dexron 3 in it. My question for everyone is should I do a complete flush and what fluid do you all recommend cause they don't make Dexron 3 anymore that I am aware of? thank you for the help.

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post #2 of 4 Old 03-04-2017, 11:31 AM
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Drain and fill with a new filter. I wouldn't flush it. Use what Suncoast says. It's available and it's usually named Dex/Merc on the bottle.

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post #3 of 4 Old 03-04-2017, 05:54 PM

 
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Why the heck would they tell you to run Dex3??

Supposed to be MercV.

Never do a flush if you don't know the maintenance history of the trans.

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post #4 of 4 Old 03-05-2017, 09:51 AM
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Quote:
Originally Posted by [email protected] View Post
Why the heck would they tell you to run Dex3??
Wondered that too.
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