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go-west.., Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 1207
Experience:  Technican with 20 years experience focused on engines and electrical.
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Have 2013 106 freightliner tow truck with 6.7 cummins and a

Customer Question

have 2013 106 freightliner tow truck with 6.7 cummins and a allison 6 speed automatic trans. my question is how come the motor is shifting gears at 2200 rpm when up shifting but when it down shifts its shifting at 2600 rpm? The truck seems under power because it is short shifting up , what could be causing this to happen ?? Patrick
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  go-west.. replied 1 year ago.
Good evening
Your tranny shifts that way at 2200 fuel economy and 2600 for turbo brake. I do believe that you can get Allison to adjust it you like but I would leave it. Let me know if you have any other questions.

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