automatic shifting issue
2004 Fx4 115,000 mi. 5.4 I noticed recently that when I stomp on it to pass someone it downshifts fine but wants to stay in that gear and the rpm's just keep climbing until I let off of the gas. It seems to keep climbing until it will redline so I let off and then it shifts back up and is ok after that. No slipping or bucking. Its not the normal type shifting Of gears when passing or climbing hills etc. It really starts to scream if I don't let off. All fluid levels are good and have been changed within the last yr meaning trans, diffs. It otherwise shifts normal upon normal acceleration
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sounds normal to me, keep in mind we have a 4 speed trans. Keep the gas mashed it should shift at close to redline, are you letting it get that high??? I think the truck has a limiter so if it really is your trans the RPM will just stop at the redline and you won't shift up, is this what is happening?
When you floor it the truck wants to stay in the lowest gear and close to the power band which is close to redline(not sure what the peak hp rpm is, I'm guessing it's up there) During normal driving it will shift much sooner for economy. |
Originally Posted by ReaperHWK
(Post 5155876)
sounds normal to me, keep in mind we have a 4 speed trans. Keep the gas mashed it should shift at close to redline, are you letting it get that high??? I think the truck has a limiter so if it really is your trans the RPM will just stop at the redline and you won't shift up, is this what is happening?
When you floor it the truck wants to stay in the lowest gear and close to the power band which is close to redline(not sure what the peak hp rpm is, I'm guessing it's up there) During normal driving it will shift much sooner for economy. |
I believe the PCM determines the shift points (my edge programmer lets me change them). I'm by no means in expert in this, maybe unplug the battery and reset the PCM????
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