Case 450b slipping issue

When it's warm it looses tranny pressure when you put it in gear but when you floor it goes to green.worse in high range goes to red in low it'll go to low yellow. It'll move in low or high though but both tracks have to be in same gear. If you try to go high/low it'll go straig and just slow right down. Driveshaft never stops turning when it won't move though

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