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KOG
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7,302 Posts
About 10-12 years ago I started putting drainplugs (1/8" metal roofing screws) in every 604 pan. Then I change the fluid every year. Takes exactly 1 gallon for refill and less than 15 minutes of time when changing engine oil. I've had to replace two torque converter clutches and no other transmission parts since then.
 

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KOG
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7,302 Posts
And, as usual, I agree with Imperial Crown. Regular fluid changes are a good idea, but I don't think you're going to solve your present problem that way, too late.
 

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KOG
Joined
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7,302 Posts
We've done one 604 to 670 replacement. Easy, but you do have to get a 670 from a minivan, not one of the car versions. And you will want to rebuild it before installing. If it's a 3.3 you cannot use a 670, three speed never made with that bellhousing pattern, only fits 3.0.
 
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