Hard downshifts are normal for a couple hundred miles after a fluid/filter change. Your allison transmission will "relearn" how to downshift and make the required adjustments all by itself.
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96 Prevost Liberty XL40'-Past MHs: 02 Monaco45'Sig,00Monaco43'Sig,99Monaco42'Exec,98Mona co42'Sig,98Newmar38'DSDP(pictured),88FW26'Jamboree .
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