They don't "slip" anything when the accumulators are low.
When there is insufficient oil left to make up or down shifts the flow sensor spool drops down and disengages the Master Clutch until pressure is built in all three transmission clutch circuits then M/C pressure will be available again. This can happen during multiple quick shifts, up or down, even if the accumulators are fully charged.
This feature is the main reason the Magnum transmissions survive as well as they do.
Charging the accumulators is a routine maintenance item, low charge is not indicative of an internal transmission problem in any way.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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