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What's with the EVO double shifting??

715 Views 6 Replies 5 Participants Last post by  JoshH
I'm not sure what gear the EVO by passes but I've read and can feel it do it. I think this is silly, it almost has the feeling of bogging the motor and certainly can't be good for the tranny. Is there anyway of getting rid of this feature?
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My truck almost always locks the converter as soon as I hit 45 mph. Sometimes it occurs at approximately the same time as the shift to 5th gear making it seem like it shifts twice.

The torque converter is a fluid coupler. It allows you to sit still in gear and not kill the engine. Because it is a fluid coupling device it will not transfer 100% of the power coming from the engine to the transmission. There will always be some slip in the converter. The exception to this is a locking torque converter, such as the converter in our trucks (and most all GM trucks since the early 80s). There is a clutch in the converter that engages at a predetermined speed/gear/throttle position combination. Once this happens the engine is solidly connected to the transmission. When the converter locks it may feel like a shift, depending on how much throttle you are giving it, and you will notice a drop in engine RPM.
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