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Hi Mike, I've worked both sides of the street and noticed right off that it doesn't seem to affect the Fords as it does the GMs. One of the parameters that the computer looks at is the throttle position sensor. If you have a partially plugged fuel filter, it naturally takes a touch more throttle for any given ground speed. The computer sees this and holds off the shift accordingly until the parameters come in. Back in the days when the 4L60 was a cable operated tranny, I used to make all kinds of friends by just replacing a $13 filter instead of overhauling their tranny like they thought they needed and thereby saving them a bunch of money. Your filter is under the truck; probably at the inside left frame rail about amidships. I quit GM in '99 so may be in error on this just a bit. :>( Another bit of trivia: The garages no longer actually change out the tranny filter when they do a service. I just do not see how they get away with this practice, as that filter HAS to be changed periodically. If you ever notice it slow to engage reverse cold, the tranny filter is plugged. Allan
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