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-   4.7L (287 cu in) PowerTech V8 Specific Topics (http://www.ramforumz.com/forumdisplay.php?f=211)
-   -   1-2 Shift Bog/Hesitation (http://www.ramforumz.com/showthread.php?t=151104)

gustapus 08-22-2013 12:34 PM

1-2 Shift Bog/Hesitation
 
I have a 2013 1500 with the 4.7L Flex-Fuel engine and 6-speed tranny. There is a pronounced "bog" or hesitation when coming off the line when the tranny shift from first to second. Sometimes it's worse than others. Dealer clams they submitted a "Star" inquiry and were told it was a specific program to extend tranny/gear life. I find this a probable fob-off from the factory. Any similar experience with your drivetrain, and any fixes?

TransEngineer 08-27-2013 07:30 AM

We do torque manage the engine (momentarily reduce engine torque) during the last half of power-on upshifts, including the 1-2. Your dealer should be able to monitor the amount of torque reduction using their scan tool (this variable is called Delta Torque and is in Nm). They can also monitor the actual engine torque (called Actual Torque [in Nm] or Engine Torque [in ft-lbs]). They can also monitor the trans input torque (called Turbine Torque I-Gear and is in ft-lbs). So they could drive with you and record these values, then show you the actual amount of torque reduction, and how long it lasts for (typically a few hundred milliseconds). They could also see if they are in line with other similar trucks.

Vulture666 10-10-2013 03:50 PM

I just got my 13' 1500 with the 4.7 engine. Mine also noticeably bogs when shifting from 2nd into 3rd. The RPM's drop right back to about 800-1000 and it has to work hard to pick up speed.

09HemiCrew 10-10-2013 09:34 PM

Torque management.


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