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2500HD/3500 HD Trucks & Drivetrain Discussion Forum for the 2001 & newer 2500HD/3500 Trucks, Transmissions & Drivetrain

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Old 01-26-2015, 10:58 AM
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More Power More Power is offline
Join Date: Feb 2000
Location: Big Sky Country
Posts: 10,455

As I recall, the Allison can be manually controlled using a Tech II scan tool. A GM tech can go on a ride-along, and select different gears as a way to test the transmission systems. Might be worth a shot.

Secondarily, the Allison has always been a "smart" transmission. The programming learns from the way thee truck is being used to modify its shift scheduling. There are ways to reset the learning process, and have the transmission begin the process again. A search here in this forum for the appropriate keywords should produce more reading and instruction. Jim
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Old 01-26-2015, 06:30 PM
race691 race691 is offline
Join Date: Jan 2015
Location: US Connecticut
Posts: 2

I actually changed the whole valve body today and it is much worse now than my original problem. I am putting the old valve body back in. When l come to a stop it almost feels as if the truck wants to creep forward
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