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Message: <blockquote data-quote="Richard L" data-source="post: 545762" data-attributes="member: 52972">Teddy,I recommend having the fluid flushed every 25K-30K miles.  A flush will replace about 97-98% of the fluid in the transmission through the cooling lines.  A conventional fluid change will them to drop the transmission pan.  That only replaces the fluid in the pan which is only about 50% of the total amount of fluid in the transmission. (the rest is retained in the torque converter and transmission cooler.  However since you are removing the transmission pan, you can change the filter although there are disagreements at to the value of the filter.  I personally feel that flushing 97-98% of the fluid at 24K-30K mile intervals and dropping the transmission pan and changing the filter every 100K miles is the best procedure for me.Others prefer to drop the pan and change 50% of the fluid and the filter every 25K-30K milesand that works fine for them.My preference to flush is based on the fact that heat is the enemy of the transmission and the fluid.  If the fluid gets to hot it will become burnt.  Burnt fluid will cause the transmission to slip which generates even more heat, which further damages the fluid, which leads to more sliping, etc.  One leads to the other in a vicious cycle.  I don't feel that changing the filter every 25K miles or so is of any significant value since the transmission filter does not work like an engine oil filter.  It blocks particles from being picked up from the pan and circulated through the transmission, but is not designed to trap and retain these particles, and therefore does not become clogged like an engine oil filter would.  Again, other may disagree, but I have never heard of a transmission failure caused by a clogged filter....Rich</blockquote>

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