One item that you always want too keep in mind is their are two types of 604 transmissions,
those that are bad and those that will go bad, you transmission going into fail safe comes
from 3 basic possibilities,, Input or output sensor failure, gear ratio error from clutch slippage,
or converter slippage in abbility to lk up...solinoid pk failure,,, Since your faceing a warm
up failsafe instead of cold failsafe I would suggest getting the input and out put sensor
changed as the are often bad at every 60 thousand and get these at Dodge not Auto
zone..Provideing your not haveing a internal clutc h or mechanical failure often Solinoid
packs will fail to connect after the unit is up to operateing temp however it usually takes
much longer than 20 minutes to fully warm up but depending on why the solinoid pak
is loseing it ability to connect,,, solinid s work off a magntic feild when energized for reasons
Im not going to explain , heat will render them unable to work , Another possibility is
you have a clutch pk failing and the cold oil is able to work and appply that cluch and
leaks to much when it warms...I doubt the dextron oil is a big issue,, My shop has built
hundreds of 604 s and often used dextron 2 with zero combacks. I say a good rebuild
trumps the oil..If you can find a honest transmission shop have you codes cked , let me
know what they are and iIll try let you know
RREYNOLD@NENONET.COMOwner of Hannibal Transmission and Road Rage quick change gears....
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