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The power director transmission operates similarly to a TA on an IH, only with a couple more twists. Thinking of an eloquent way to describe its operation isn't easy so bear with me. Like a TA the power director (PD) doubles the number of speeds available, allowing you to move from low to high on the go (nice for headlands, tough spots, etc). That being said, don't dilly dally going from low to high, if you have a load you will lose momentum, and its just like slipping the clutch....bad. Unlike most IH tractors with TA's a PD tractor does not have a true Indepenant PTO, its live, but not independant. With the PTO engaged the foot clutch will stop the PTO, so if you are using a baler for example where live PTO is important, movement needs to be controlled with the PD clutch (hand clutch). For some people this is a real problem for others it is not, it just takes some getting used to. Like a TA, the durability of the whole system is entirely up to the operator. One thing to consider, the main part of the transmission on these tractors is what we call unsyncronized constant mesh, whereas on an IH its just unsyncronized. This means you can't go trying to change gears while still rolling or untill the gears have completely stopped. This is where the stories of jumping out of gear on the 190XT's comes in. I believe on the 7000 series they installed a transmission brake to get things stopped quicker, in any case, its not a crash box tranny so be gentle. As for the cabs, what little experience I have was in a tractor where the AC didn't work so I can't help you there. I can say that rear visibility is pretty good (can see the drawbar without craning your neck). However, I hope you aren't much over 6 foot tall or you will be hitting your head a lot, as the sides of the cab come in as you get to the top. I believe the 7020 had the 301 diesel (someone correct me if Im wrong). This is a great engine, runs smooth as a top, doesn't use much fuel at all, etc. The one drawback is it can be a dog to start in cold weather. Clear as mud? I appologize if that doesn't read very clearly. Alex Disclaimer: Most of my experience on Allis' comes via 190XT's and 200's so there will be some differences in operation but generally the terms should still apply.
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