in any event, some diagnostics might be in order from a Freightliner facility. Should be able to get into the Allison manual. They no longer print manuals (and or course won't give us a pdf version), but if you have a serial number you can register and get access.
PLEASE do not send questions via Private Message, my inbox fills up too quickly. Post questions in the forum as a new thread so that other users can benefit from the answers. Use Private Messages for sensitive information only (VIN, Contact info or things you do not want the public to see).