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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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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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