Twice the oil and line pressure to move in reverse? Double gearing? No, that's not how it works. Line pressure is regulated by varying the displacement of the hydraulic pump as commanded by the PCM. Line pressure raises with torque request.(how far you push gas pedal) Forward or reverse, it's simply a matter of which combination of clutches are commanded on and off. That said, check the parking brakes. Cold moist air can make brakes grabby. If the park brake is not fully released and is dragging a bit, it can do exactly what you're describing. The filter in a transmission is large enough to hold all of the friction material and not plug. If the trans filter were plugged, it would be slipping bad, fluid would be black.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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