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there are 2 parameters that will prevent the trans from shifting
1 rpms to high,which you know
2 road speed,you have to insure the vehicle it not moving at all when going from say reverse to foward.
if you have a issue still then get back to me and we will check for codes
Allison states as long at the rpms are under 1000 rpm you are ok
im thinking if you are having a problem with it not going into gear at the 750 rpm them your right about the other rpm parameter thats there so people won't drop the driveshaft when stifting--solution-- adjust engine idle to 725 rpm to keep your self away for the problem area, 1 question do you have the push button selector ??
haven't heard from you,do you have any other questions ??