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After having driven a S60 with 6 speed Allison I'm a bit perplexed by something.  My understanding was that the optimal range for using the Jake was around 2000 RPM up to a safe maximum of around 2200.  When cruising along at 65 or so and heading down a long slight grade in which the coach itself will not hold itself back in 6th without either braking or the Jake the Jake wants to downshift 2 gears into 4th and that takes you to darned near 2500 RPM.  One would assume that the controller on the unit would not let the trans downshift to an unsafe RPM for the engine, but I have not seen an reference in anything I've read that it's ok to operate at that high of an RPM on a regular basis?

I can't for the life of me understand why it's programmed to drop to 4th automatically as there are so many times that a less agressive breaking would be preferred.  Would to be so much better if it either stayed in 6th initially with a slight uptick in speed triggering 5th and/or braking on top of that should make it drop to 4th.