Ronmar
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On the Allison, it enters lockup in our 3rd gear when turbine RPM approaches input RPM. It stays locked up 100% of the time all the way up thru 7th and back down thru 3rd. It drops out of lockup in 3rd most likley when it senses the downshift to 2nd is iminent.
The main thing the pacbrake interface to the trans does is to preselect 4th gear(our 5th?) if you are in a higher gear...
The main thing the pacbrake interface to the trans does is to preselect 4th gear(our 5th?) if you are in a higher gear...