Engine/Transmission (1994 - 1998) Erratic Shifting

[PSInt]

Update

Still working on it. In case anybody's interested the Chrysler TPS Part Numbers are (old number) 4746719, (new and improved number) 4874412. rockauto.com has it for $159. 79, and moparparts.com has it for $168. 75. For those of you that have an in with the government supply system, the NIIN is 2990014319442. Try not to get caught using that one.



Still searching... . updates as they come in... .

 

[Willys]

Rockauto has a TDR 5% discount. There is a thread here with the code- though off the top of my head I think it is 'turbodiesel'. Hope that helps.



Howard, I'm still using the pot on my '95 with no problems and am very happy with how it works.

 

[KMott]

I have been having issues with Overdrive kicking on and off non stop, so i pulled the TPS off tonight, and tried to clean it up. Now i have no OD! Anyways, i tried unplugging the connector off of the TPS and everything shifted like normal (1-2-3) until it was time for overdrive. So to clarify, it seems as though the TPS does not affext 2-3 shifting, it is for o/d and lockup.

kevin

 

[Joe G.]

Your '94 has a 47RH transmission. All of the shifts except OD and TC lockup are controlled by a fly weight governor. No electronics involved with those shifts. In a stock set up the TSP is one of the inputs to the PCM used to decide to apply a ground to the OD or TC lockup solenoids on the valve body. If you have made no modifications to the circuitry for OD and TC lockup you must have a working TPS for those shifts to work. The other shifts will work even if you threw the batteries overboard.

 

[JPittinger]

I have been having issues with Overdrive kicking on and off non stop, so i pulled the TPS off tonight, and tried to clean it up. Now i have no OD! Anyways, i tried unplugging the connector off of the TPS and everything shifted like normal (1-2-3) until it was time for overdrive. So to clarify, it seems as though the TPS does not affext 2-3 shifting, it is for o/d and lockup.

kevin

PSInt has a 47RE, not a 47RH...

 

[6btsmoker]

i may be a little late in this but , the problem started after the truck sat for a month , right ? i have seen kick down linkages get rusty and stick once in a while . just a thought .

 

[KMott]

PSInt has a 47RE, not a 47RH...

Sorry, i dont even know the difference (until now) and i assumed they would be the same. I guess iof it was that simple of a test you would have tried it!

Since then, i read some of the old 'tps mythbuster' thread, and i picked up a 5K potentiometer from radioshack for 3 bucks. I wired it up tonight and it works like a dream. I set the signal to 1. 8 volts and havent played with it yet as the potentiometer is still under the hood. Od lockup comes in around 50mph. After a whole week of driving on the highway with no OD or lockup (or cruise), what a difference. I can get it around 20mph when O/D is locked out, and when you have a stock auto, Lockup is like heaven! Its the only time my truck accellerates without holding up traffic!

Something you may want to consider PSInt, if you continue to have more problems. Good Luck!

 

[Howard Durand]

KMott,



If you haven't noticed yet, you no longer have manual kickdown nor under load downshift while using the pot.

As far as I am concerned, that is no problem. The only time I have used the kickdown is to get into lower gears when pulling up a hill.

The automatic downshift under load is nice to have but I am using a foot operated dimmer switch take care of that problem. I can use it to either unlock the TC or open up the OD circuit. Whichever works best.



The first time I ever used kickdown in my truck, I thought it was a passing gear. That was a big mistake!

 

[KMott]

Howard, maybe its just my auto, but anytime my truck kicks out of lockup it loses speed, winds out, and wont accellerate. So i am more than happy that i dont have to worry about it downshifting. Im sure once i get a built auto, downshifting will have some kind of positive effect, am i right?? I see you are running a DTT. I called them last week, but havent heard back. Any reccomendations with what route to take?

thanks, kevin

 

[Howard Durand]

Kevin,

That pretty much describes it. The downshift is handy when towing, it helps to get out of a high egt situation. Otherwise, it can be dangerous.

The upgraded transmission performs better because it, accompanied by more power, reduces the need for a downshift.

I am pleased with the transmission and the people at DTT. They determined which convertor was needed and I had them put in the input shaft upgrade because of the exhaust brake. One factor in my choice is their location. I was able to take the truck to their shop for the work.

I am sure that if you are interested, they will talk to you. Call them up, they don't seem to respond to e-mail very well.

Howard

 

[PSInt]

Unbelievable

Finally, got my new TPS today. Hurried home after work to get installed... Oo. Got it on, took it for a ride. First time 2-3 shift seemed to hang a little but after that it shifted better than new ! About an hour later I had to go out and guess what ?? Shifts different but still not good. Still hangs 2-3 shift once in awhile. REALLY FRUSTRATING ! The new TPS affects everything, however after spending a ton of money it still isn't right. Acta kinda like throttle pressure cable bu t it moves freely and appears to be in good shape. I'm about ready to start parting this damn thing out.

 

[Swamp Donkey]

Hey PSInt,



I was having horrible wanky shifts for a bit. I called Bill K @ DTT and told him what was going on. In about 1 second he told me I needed a noise filter on the wire going from the TPS to the PCM. $40 bucks later my truck shifts like a dream. You might want to try that. Tell them Swamp Donkey sent ya! 1-866-402-5004



John.

 

[PSInt]

Thanks



That'll be my next step then. I want to make sure I've exhausted everything before I take the transmission out again... .

 

[Swamp Donkey]

One more thing to try for free is switching out your transmission relay that is under your hood. Try swapping it with the horn or windsheild wipers etc. Same part numbers... .....

 

[PSInt]

Hmmmmm Relay ??? I'm not aware of a relay. What's it for ? Where is it ? Hard to believe a transmission needs all this "Stuff". Years ago I was a mechanic at a Chrysler Plymouth dealer, and I've overhauled more Torqueflites than I care to remember. There were no relays and they worked just fine. The only thing with wires was the reverse light switch and the neutral safety switch... Damn I love progress... . #@$%!

 

[Swamp Donkey]

I would think your 96 has a relay. Check underhood by drivers side battery. There is a fuse/relay box there with all the info under the lid of the "black" box. Good luck.

 

[biggy238]

Transmission Speed Sensor controls 2-3, 3-4, 4-3



If it isn't relaying the internal speed to the PCM, it will shift when it wants (if at all)



I broke the connector on mine and had to run a week without it. I've had it on a year and yesterday the truck started acting odd again. Got under it and one of the wires was missing insulation (dunno why). I put some liquid insulation on it and that has cured it.





Symptoms of mine: Delays 2-3 shift, shift out of 2 but not into 3, and then lunged into 3. Smooth shift into 4 but locked and unlocked at will, and would downshift from 4 to 3 at highway speed.





The sensor is just forward of the transfer case mounting flange beside the shift linkage for the t-case on a 4X4





I don't know if it will help any of you But that, combined with the gov pressure sensor and Gov press. solenoid, control the electronic shifts 2-3-4



I did have my cables replaced under recall, and the TPS fell apart when they did it, so I had/have a new TPS

 

[bmw54]

Did you ever find the source of the problem. I had this same problem and replaced the pressure sensor and it is fixed. also you have to reset min. throttle, clear codes, battery disconnect via relay. this was done using snap-on scanner. I know this is 2014. and this problem was posted 2006.

 

[crabman]

Not sure if this link will help you or not but it has some very good info from people who really know about transmissions.
https://www.youtube.com/watch?v=j4v3hDs4VKQ