Just had an interesting conversation w/ a Mack truck salesperson. We were discussing extended warranties on our Dmaxes. He was telling me that warranties alone on their transmissions are 2K to 4K, and that the trannies run 15K to 20K to replace. He told me that Allison just came out w/ a bulletin stating that they would not honor any warranty repair over 50K miles if the Allison did not have Transynd. I don't know the full truth to it someone here probably knows better than me but that is pretty convincing to switch over even though my truck won't be used as hard as the Mack trucks he sells. Maybe Big Al can shed some light on this.