I was in the parts house the other day and was thinking about changing out my transmission filter and when I spoke to the guy at the counter he asked how many miles I had on he truck. I told him it had 155k on it, and he told me that if I did it would cost me more in the long run. That changing it at such high mileage would release all the goo that’s already in there holding the thing together. I do believe he is overreacting a bit but to air on the side of caution. Has anyone had any major issue after changing their transmission filter