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Old 07-15-2021, 09:24 PM   #1
New Member
 
Join Date: Jul 2021
Posts: 8
Allison 2500PTS transmission reprogramming

Does anyone have specific info on what is accomplished by reprogramming the tranns for the 6th gear I hear about. i am at top speed at 65 would like to up it to 70MPH or 75MPH to better access into lanes at highway speed.

is there an engine governor that might also be changed?

i have a 2007 Bluebird short buss (30' outside) with CAT C7 engine. Allison 2500PTS 2006 or 2007 not sure on trans.

any info will be very much appreciated...

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Old 08-15-2021, 01:14 PM   #2
Mini-Skoolie
 
Join Date: Nov 2018
Location: Milton, ON
Posts: 15
Year: 2006
Chassis: Freightliner
Engine: Cat C7
I have exact same engine/transmission, do you not have overdrive? When I was driving it back home after purchase I was able to get it up to 70MPH in the straights and it was quite nice.
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Old 08-15-2021, 06:57 PM   #3
Bus Nut
 
Join Date: Aug 2020
Location: Mesa, AZ
Posts: 682
Year: 2003
Coachwork: Blue Bird All American
Engine: 8.3 Cummins
Rated Cap: 2 adults and two pigeons
If it is a 6 speed transmission there will not be a way to get it unlocked via BlueBird. They will not provide a letter for Allison to unlock the top gear for liability reasons despite the bus no longer being a bus. I am in the same boat. The possible only choice would be to take the TCM and have it programmed by a tuner. There is someone that is recommended on here but I do not remember who it was or their info.
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allison, bluebird, cat c7, increase speed, reprogram

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