Join Date: Jul 2004
Location: Good Ole Needville, TX
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Re: Automatic transmission shift question while under load.
<span style="color: blue"> yougotme ,
Between what gears is it "hesitating" at? The transmission is still the 5R110, but I have heard that there are some differences between those behind a 6.4L and a 6.0L. Some one correct me if I'm wrong, but I don't believe that Ford changed the shift strategy, and if they haven't, you could be having the 2-3 shift hesitation. It's not really a hesitation, though, because during this shift, the transmission has to disengage one set of clutches and engage another set (unlike only one change in the other gears), so it takes more time during this gear change than the others.
If you have noticed a change during this shift from what I described to a much longer hesitation, then you could have sticking solenoids. The solenoids control all the shifting done in this transmission with commands given to them by the computer. But one thing to mention is that by controlling the transmission in this way, the computer has really good monitoring capabilities and if something is wrong, it will start falshing the Tow/Haul light on the dash and most likely store a code.
Now, if you're experiencing this at higher road speeds, then HoneyShucks touches on a valid point. When you get in Sixth gear, yes I said Sixth, there is one more action done by the transmission and that is to lock the converter. You will be able to tell it's locked by watching the tachometer. When you count the Fifth shift, watch the tachometer and feather the throttle a little. When you press it down, you will see the RPMs rise a little and when you let off a little, they will drop accordingly. Now, while the converter is still unlocked, hold a steady throttle position and watch the tachometer. If everything is working right, you will see it drop about 200-300 RPMs, at which time you can press the accelerator some (not enough to cause a downshift) and the truck will begin to accelerate but the tachometer will not immediately rise in RPMs at it did with the converter unlocked. It will now act like you are driving a truck with a manual transmission, as the input of the transmission (torque converter) will be solidly coupled to the output of the transmission through the torque converter clutch.
I hope this helps explain things a bit, and please give us some more detailed description as to when this is happening, so that we can try and better troubleshoot the problem, if you are having an actual problem.
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* '04 F250 XCab LWB 4X4 w/ FX4 *
* TorqShift *
* Manual 4WD *
* Carpet Delete *
* No. 2 ONLY *
* High-Idle Mod *
* Fumoto Valve *