Trans acting normal?
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Lead Driver
Joined: Sep 2010
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Trans acting normal?
Not sure if the 4.10's have anything to do with it but seems as though that, TRYING to maintain 40mph(city speed) seems that the trans is stuck between 3rd/4th. Shifts smooth but maintaining speed itll act up...sometimes. Fluid is FINALLY correct(stupid story).
Has anyone done business with this company
http://www.monstertransmission.com/Heavy-Duty_c_3928.html
Has anyone done business with this company
http://www.monstertransmission.com/Heavy-Duty_c_3928.html
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Lead Driver
Joined: Sep 2010
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Morn'n mark....maintaining the city speed, the trans cant decide if it wants to shift into 4th or stay inb3rd. Rpms verfy it. Its why i mention the gear ratio. Also, its not ALL the time it does it but majority. Im green when it comes to autos, boss
More Turbo
Joined: May 2016
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The Coast Clutch (Overdrive) Engage/Disengage at approximately 42 MPH (Load dependent). You're right at that "Grey Area" where it may shift back and forth. Especially utilizing Cruise Control. Is this the only symptom? Otherwise, suggest you alter your speed up or down slightly to avoid the I/O of the Coast Clutch.
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Lead Driver
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You nailed it pirch..
. Only on city roads and thats the posted speed. Wonder if, keeping her out of OD would help? Been looking into trans rebuilds/remans along with different TQ's because im goin nutz. Then i read about "low stall speed" convertors. Now, i really have a pretzel in my head..
. Only on city roads and thats the posted speed. Wonder if, keeping her out of OD would help? Been looking into trans rebuilds/remans along with different TQ's because im goin nutz. Then i read about "low stall speed" convertors. Now, i really have a pretzel in my head..
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,731
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From: SE Florida
You may be thinking of the torque converter clutch. That engages about that speed and is load dependent. It is also not overdrive. Overdrive is fourth gear and is created by engaging the overdrive clutch.
If it is only doing this at one particular speed it is most likely the programming that is causing this. Installing a new transmission won't fix this. New software is the only way to fix it.
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Lead Driver
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Thats a perfect phrase for what's happening.."hunt".
I'll try thr no OD on and see if that works. Not sure if ever a chip or program to the pcm since i just bought it end of dec. However, i did have a VSS installed and loaded up.
Thanks fellas, will update over weekend
I'll try thr no OD on and see if that works. Not sure if ever a chip or program to the pcm since i just bought it end of dec. However, i did have a VSS installed and loaded up.
Thanks fellas, will update over weekend
Cross-Country
Joined: Oct 2015
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I can say from my limited experience driving my truck, not towing, I can cruise as low as high 30's while in OD. That or maybe my Speedometer is registering a few MPH high.
I do have to reach the minimum 40-42MPH to shift into OD but then I can coast a bit down in the high 30's and maintain just fine without speeding to much on 35 limit roads. Having said that, this is on flat roads.
If I want to accelerate without down shifting, I must manage the pedal just enough to accelerate without pressing to hard to down shift. I can imagine having a hard time doing the same thing under 40MPH on an incline.
Hopefully this helps
I do have to reach the minimum 40-42MPH to shift into OD but then I can coast a bit down in the high 30's and maintain just fine without speeding to much on 35 limit roads. Having said that, this is on flat roads.
If I want to accelerate without down shifting, I must manage the pedal just enough to accelerate without pressing to hard to down shift. I can imagine having a hard time doing the same thing under 40MPH on an incline.
Hopefully this helps
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Lead Driver
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When testing the truck prior to buying it, i dont remember it doing that. Thats why im wondering if the 4.10 gearing is playing a role in this. Does the pcm do anything that involves said rpm/speedo? Gunna hit the road here ina few. Will post up later
Posting Guru
Joined: Jul 2017
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The difference between 4.10 and 3.73 is only about 10%. So any symptom you have with your gears would happen at a 10% higher speed if you had the default gears.
So I think it is unlikely to be your gears per se. Three questions...
Did you change the gears? Asking since you mention them.
Also, do you have tunes on the truck?
Finally, do you see the problem if you lock out overdrive?
So I think it is unlikely to be your gears per se. Three questions...
Did you change the gears? Asking since you mention them.
Also, do you have tunes on the truck?
Finally, do you see the problem if you lock out overdrive?
More Turbo
Joined: May 2016
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So, the Torque Converter is controlled by the OD? Not the Coast Clutch? Like SGT Shultz, ..... I know nothing..... where A/T's are concerned. I really wish I had entered that field. If, for no other reason than the Knowledge that could be obtained.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,731
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From: SE Florida
The torque converter is controlled by the computer, which commands the torque converter clutch solenoid to lock or unlock the torque converter clutch. Neither the coast clutch nor the overdrive is related to the torque converter clutch. All three are separate items. The torque converter can lock or unlock if the coast clutch is on or off, or if the transmission is in overdrive or not in overdrive.
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Lead Driver
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Finally was able to drive her yesterday(wife calls it our sunday truck). With OD off, there was no "hunting" going on. But strange though, doinh 35-40 then approaching a stoplight, to me, the truck felt like i was dragging an anchor up until 10mph ish, then "thru the pedal" you can feel the trans "release" and coast/brake accordingly..is this the tq still locked up until a desired speed? It goes thru the gears just fine. No hard shifting..etc with OD off but you definitely know that theres that 1 more gear left, IF i turned OD on....
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