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Old 05-31-2012, 10:39 PM
Dutch Dodge Dutch Dodge is offline
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Question High pitch whine while shifting

When I am going on to the highway, driving normally, right before the truck shifts it makes a high pitch whine. It only makes it makes the sounds around the lasts 300 rpm's before it shifts. Next to this I also have another thing that caught my attention, when I leave my truck standing overnight and I start it up it turns over.... small hesitant and it runs.... for both issues it doesn't throw out any codes.... it is a 2010 Truck.... is this normal or am I too anal about things
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Old 06-01-2012, 08:24 AM
TransEngineer TransEngineer is offline
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If the whine is "right before" it shifts, it may actually be at the very start of the shift. Upshifts occur in two phases: the torque phase and the inertia (or speed change) phase. During the torque phase, torque is handed off from the releasing clutch to the applying clutch. Once the torque handoff is completed, the turbine speed drops (which causes the engine speed to drop), which is what most people would notice as "the shift." But the shift actually started before the speed change.

Is this on one particular upshift (like a 3-4), or on all of them? At all speeds / throttles, or only at heavy throttle? Try this: Use your ERS control to limit you to the lower gear (for example, if it's a 3-4 shift where the whine occurs, tap the ERS switches to limit you to "3"). Then see if you get the same whine (at the engine speed where the shift would normally occur). That'll tell you whether it's in the engine alone, or related to the upshift.
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