I have worked for a Allison dealer for 35ys and the biggest problem or failure is not changing the fluid. I don't know what it is but people don't think about the fluid untill they have a trans problem. Those who do check the fluid see its nice and red and think its OK. Transmission fluid breaks down from heat,and just because it looks good doesn't mean it is.Heat breaks down the additives that keep all the seals soft so they seal good and keep pressures up,so you have good apply and lube pressure. We had Dextron fluid tested at different temps and found that if the temp didn't get above 175*the fluid would last 100,000mils BUT every 20* above 175* cuts the life of the oil in half thats right in half. Most cars operating temp.is over 200*and then there is the catlic converter which they mount next to the transmission which gets around 1800*. Your fluid chould be changed about every 10-15000 mils. I have always changed my fluid at 10,000 mils and have put over 200,-300,000 no all my cars and have never had a trans fail. Its kind of like you can pay me now or more later. It is also a good idea to pull the pan and change the pan filter if your car has a pan. If you have a pan ,pulling it will let you see if there is a problem.
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