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The torque converter in your Allison transmission acts as a clutch to basically allow power to be applied into it that will not come out of it based upon certain criteria, meaning total engine power is not making its way to the ground. The point at which all power coming into the torque converter is also coming out of it is called "lock up." The CoPilot Lockup Kit forces torque converter lockup based on vehicle speed and is not intended for street use. When turned on, the CoPilot Lockup Kit will force lockup in 2nd gear under wide open throttle to offer unhindered transmission performance when you need it most.
- ManufacturerATS Diesel Performance
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what if your truck is a 6 speed and not a 5 speed do you still have to use this??
Has it been converted or are you not running an 01-05 truck?