Allison is coming out with their new 9 speed medium duty transmission. It's been known about for quite a few years now but it's finally coming to market. I can tell you that it is 100% just like the current 1000/2000 series 6spd, of course with some added parts and a bit longer case. It appears to me that it literally is based 100% off of the same platform. I have access to theirs parts side and the parts break downs look just like the current transmission. It now has 6 clutch packs and 4 planetaries. 6th is 1.00 and 7,8,9 are all overdrives. It's rated for 33,000LB with park pawl and a staggering 57,000LB without park pawl! I just wish GM wasn't so greedy because this would have made many costumers WAY happier in my opinion.