Mine is 89 Cherokee Laredo, 4 cylinder, 2.5 litre. The odometer now reads 250,000 Both the motor and transmission are in perfect running condition. The transmission itself remains forceful, smooth shifting, no slipping nor jerking. The last time I replaced the fluid (with DexronII) and filter was at 70,000. The fluid in it, is now 180,000 old. At a point in time in the past I had wanted to change my transmission fluid, but I had heard so much about the benefit of "leaving it in there to age for better pressure." After kicking around for some while, I simply forgot the whole idea. "Neglected" is a better word. The urge to replace the fluid does come back from time to time., and the thread by Fredjacksonsan in the recent topic entitled " new 4x4ing" makes me realize even more how important it is to have clean fluid in all the ducts and chambers within the transmission ( I have never really seen the inside but just imagine it).
Is it too late to think of it now? Does the myth of "leaving it alone" hold the true benefit?