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 - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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