Scrapiron - I've noticed that the Allison seems to shift nicely when the rpm range is as you mentioned, and overall, the truck gets up to about 50 mph fairly quickly - in about 1/2 of a mile or so. If the engine is revved up to 3000 rpm, it doesn't really seem to get to speed any more quickly than at the lower rpm's. Am never in a hurry with this vehicle anyway. My real reason for redline concern is in the event the transmission should happen to downshift when I already am at about 2800 rpm. This may send the engine into redline according to the previous owner (who had to replace an engine for this reason).