Transmission question
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Mountain Pass
Joined: Nov 2016
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Transmission question
I noticed when I'm accelerating and the truck is in third year that the RPM will drop slightly, maybe 200 RPM or so as the truck continues to accelerate.What causes that? Shouldn't the RPM continue to climb until it shifts into fourth gear?
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Mountain Pass
Joined: Nov 2016
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Will it lock up while accelerating like that? I thought it locked after you were at more of a constant load. Because the rpms were climbing then it dropped the 200 rpm or so and then the rpms started climbing again like normal, then it shifted to 4th.
Lead Driver
Joined: Sep 2006
Posts: 5,664
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From: Cartersville, Ga
Yes. That is it locking in third.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,705
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From: SE Florida
Yes, it will lock while accelerating.
After you reach a certain RPM the torque converter is no longer multiplying torque. It's slipping because the converter clutch is unlocked. Locking the clutch in this case will provide more torque to the wheels, less heat into the transmission, and better fuel economy. That's why it locks at that point.
After you reach a certain RPM the torque converter is no longer multiplying torque. It's slipping because the converter clutch is unlocked. Locking the clutch in this case will provide more torque to the wheels, less heat into the transmission, and better fuel economy. That's why it locks at that point.
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JOHN2001
1999 - 2003 7.3L Power Stroke Diesel
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Feb 12, 2014 07:23 AM
