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F-U-CANCER!!!
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Discussion Starter · #1 ·
I have a 96 cummins 4x4 with an auto in it. It recently started shifting way to quick on occasion. It will shift clear up to lock up by ~ 15mph. If I shift it manualy everything is cool. I am thinking the valve body controls this, but would like a few other opinions.

thanks
 

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Because racecar
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You may have a problem with the governor soleniod, transducer, or possibly a problem with the throttle valve cable either broken, disconnected or out of adjustment
 

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TV cable out of adjustment? They like to get grungy inside the sheaf. Ask on dieseltruckresource.com. Lot of experience on diesel trannys around there.
 

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Because racecar
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TV cable out of adjustment? They like to get grungy inside the sheaf. Ask on dieseltruckresource.com. Lot of experience on diesel trannys around there.
Do you have any transmission experience? I was giving possibilities, and yes cables do stretch and can become out of adjustment, or the lock can become weak causing that also.
 

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Can't lose with 42s
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Pretty sure a faulty TCM module would cause this too
 

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Do you have any transmission experience? I was giving possibilities, and yes cables do stretch and can become out of adjustment, or the lock can become weak causing that also.
That was in agreement with you on the tv cable.

There are guys on the other sight I suggested that breath specifically CTD's and Dodges. I know the TV cable wheres out and have done maintenance to mine, but I don't have over drive and my gearing is probably different so if he needs to know specific shift points, he'll get advise quickly over there.
 

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F-U-CANCER!!!
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Discussion Starter · #7 ·
thanks

I asked at dtr also, thanks. I did not get as many responces as here though. I am going to look into lubing the tv cable?? I am unsure how to check the other stuff. This problem is intermitent, works fine one time, screws up the next???

Appreciate the help, any way to check any of the electronic stuff??
 

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Because racecar
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You would need a scan tool to read the governor pressure solenoid, It sounds like it is the tv cable sticking, I would replace it rather than trying to free it up.
 

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keep your stick onthe ice
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just a thought but if the tv cable sticks it will give you higher shift points, it wouldn't really strech some times and be not streached others. does a 96 even have a kick down (tv) cable?? thats got to be right near the end if it does. If its an electric controlled trans i would think gremlins, hydro controll maybe gum in the valve body.
 

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F-U-CANCER!!!
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Discussion Starter · #10 ·
:confused: I have been checking things out. I put the tps back to stock, and thought that was all that was wrong cuz it worked good for a couple weeks. I checked the tv cable and it seems fine (no snaggs, drags or catches). Now it started doing it again. :(
 

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keep your stick onthe ice
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put the tps back to stock???
 

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Yankabilly
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just a thought but if the tv cable sticks it will give you higher shift points, it wouldn't really strech some times and be not streached others. does a 96 even have a kick down (tv) cable?? thats got to be right near the end if it does. If its an electric controlled trans i would think gremlins, hydro controll maybe gum in the valve body.

yes they still have a TV cable...

I agree with tranny tom...

you may even check to see if the cable has popped of the arm on the trans itself and make sure if it is there is a spring attached like a throttle return spring.
 

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F-U-CANCER!!!
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Discussion Starter · #13 ·
Cartman,

Any way to test the tcm? It is very pricey, but could be the problem??
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user name wrote, Put the tps back to stock??

I had advanced the tps to set the proper voltage. It is done fairly often with folks at dtr to make the tranny/converter lock at the right time. I have now set it back to the stock location. I would not think a tps could force early shifts either, isn't it supposed to only control lock-up??
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KILLER B,

The tv cable seems to be working correctly. I am not trying to second guess anyone, I just do not understand how the tv cable could make the tranny shift early???


new question, Could it be that my computer needs flashed, or my vss is bad??


thanks again everyone!!!!
 

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Because racecar
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Before you start throwing parts at it, you need to have the truck scanned. Not only to check for codes but to also check vss, gov., pressure ect. under the trans data.
 

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F-U-CANCER!!!
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Discussion Starter · #15 ·
Before you start throwing parts at it, you need to have the truck scanned. Not only to check for codes but to also check vss, gov., pressure ect. under the trans data.
Will the scanner see anything since I have not had a check engine light on?? This realy sucks and I wish it were the 94-95 style tranny = no electronics.

thanks
 

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Buy a Fiat! Save the UAW!
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one thing that hasen't been said about the Tv cable is where it hooks in the trans can fall apart. its been noted to me that several have came apart. in the advent of this the trans goes straight for up shift since it sees no throttle presure. hence the 15mph up shifts
 

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give 'er sh*t ay?
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the vss would affect it, but it should also affect your spedo. so that is unlikely. check codes first, easy thing to do. and because no one has asked it, or i just missed it... hows the fluid?? full?? clean??

when does it do the problem? when its cold, or hot. after its been sitting a week or 5 min? after it shifts funky for the time, is it normal after that, when you need to accelerate again?
 

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F-U-CANCER!!!
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Discussion Starter · #18 ·
Yetti,
I will check it out, that makes sense.

noodles,
Fluid is good. I had heard about the vss thing. The speedo, I have noticed it act strange a couple of times. It was verying a little bit while maintaining one speed.
Mostly does it when warmed up, not always. It will do it and then you can shut it off for a second and it might quit?????

thanks
 
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