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Your stock 6.7 what rpm's while cruising at steady 75 ?

3K views 5 replies 5 participants last post by  uriasdw 
#1 ·
I have a 2012 6.7 PSD 4x4 with the 3.55 gears and the 20" wheels with the original 275/20 Michelin tires.

I have a Tow tune I am running , so guys with stock trucks ...
What RPM do you run at while doing a steady 75 mph ?

My reason for asking is that I am not sure if the torque converter is locking up or not on the highway ( I am not sure if it is disabled in the tune )

I seem to be running around 1700-1800 light pedal and 75 MPH

Thanks in advance
 

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#3 ·
I have the same Gears and Tire Size. Those RPM's look spot on.

Your Torque Converter is definitely locked. On my MinniMax it shows if the TC is locked or not.

TC stays locked in 2-4th gears while on the throttle/light load, then unlocks when you take your foot of the thottle.

5th & 6th lock as soon as they get into that specific gear and do not unlock until you slow down to stall speed then unlocks the TC.
 
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