Fred,

About thre years ago I opted for a new (factory rebuilt) transmission. It exhibited harsh 3/4 and 4/3 shifts and the Allison computer showed excessive clutch wear. Since our coaches are of the same vintage what i was told may be of interest.

According to the dealer Allison had a run of transmissions whose clutch materials exhibited excessively fast wear and our coaches are in that time frame. The result was often large amounts of clutch material deposited throughout the transmission. Since the cost to replace clutches and do whatever service was necessary to complete the repairs was not much cheaper than just R&R I opted to go with one that had all the upgrades and latest software. I am not a transmission expert and even if I was it wouldn't matter in your case because you are now with the experts who can correct whatever the problem is.