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I have been noticing more fuel consumption in the 93 Aerostar I use for work. The shifting seems to be less pronounced than it was in the past, and I think at times its not shifting into OD. When I back off the gas the car slows down a little more than normal as if it was in 3rd gear instead of OD. To test it I then move the shift from OD to D and I can feel the downshift, which is confusing me. The less pronounced shift has me a little bugged too, but it is felt from 1 to 2 to 3, OD is very hard to detect, and leads me to believe it might be intermittent in the nature of the problem.
I have about 161,000 miles on the original unit, the fluid looks good, and has been serviced every 24-30,000 miles. Service included pan drop, new filter, and fluid. I then drive a few miles remove about 2 qts fluid replace, I do this about 5-6 times. It doesn't slip. The brakes are functioning properly and not hanging up.