I hope this is not too vague. We have a 2014 Fleetwood Excursion 33D with the 300 HP Cummins and (what I think is a) Allison 2500 transmission. We bought it new off the lot in March or 2016 and it...
Stay away from any RV dealer for anything that is not house related. You need to see an Allison dealer ASAP. The Allison computer will store any trouble codes.