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I have noticed a few times, when the temperatures are cold (20's to 40's), and while the car has yet to reach operating temperature (i always remote start for no less than 2+ minutes) my transmission at times, 3rd to 4th gear, does a quick hesitation (with a slight rpm bump). almost sounds like a slip at shift. This is only a one time event while cold and does not repeat itself during the drive. Has anyone had a similar experience. No code has registered.
 

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during cold warm up driving, its normal for the automatic to delay upshifts - this helps get the cats up to operating temp faster by holding revs higher.
 

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It's normal for an automatic to do that when it's cold. You being from Texas wouldn't know that ;) My truck shifts extremely sluggish when it gets to around 10 or less degrees because of my deep transmission pan. The fluid has to get warm before it operates normally.
 

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Its not higher rpm Its like it shifts to 4th too soon and slips a little. Mine has done it since day one. I usually auto stick for a few minutes so i can have the rpm around 2500 before i shift to 4th.
 

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What you could also feel is the torque converter clutch engaging / dis-engaging.

From 3rd gear on up (light loads) the TCC locks up...when there's more load, it will unlock (higher rpm) and if there's more load/throttle you'll then get a downshift.

I can feather the throttle on my 'Benz (same A5 trans) and get the TCC to unlock when I want a bit more acceleration w/o triggering an outright downshift.
 
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