Okay here is my delemma, I have had this problem for over a year and have finally started looking into it. I have no OD. I am pretty sure it is electrical since once in that time it suddenly grabbed OD for about a mile then it was done. TPS is set a little over 1V idle 4 or so WOT, Tranny temp sensor is fooled with a resistor tach and speedo work so vehicle speed sensor and crank sensor must be fine cruise works great so brake switch must be okay. TV cable is adjusted correctly bands are adjusted new fluid in it runs about 150* normally. IT just doesn't have OD. I am heavily leaning toward the 4th gear TCC solenoid in the tranny but don't know how to test it. there is continuity between the plug and the solenoid itself but that only means there isn't a broken wire not that the solenoid works. If I just ground the front or rear pin should I hear the solenoid do anything. Like I said the TCC works both off the computer signal and if I use the mystery switch, but no OD. Only other thing I can think of is the dash switch for the Od does not work, both filaments look broke but I can't imagine the overdrive signal goes through a chincey little switch.

Please help 55 mph top speed sucks!

Justin

 

There is also a temp sensor in the tranny hot line if its bad you'll not have OD

 

yep that's the one I fooled with the resistor, 5.6K ohms If I recall makes it believe it is right around 105* give or take.

 

Why don't you try to wire the TC lock-up manually? You need to run a ground wire that you can connect to the computer...I don't remember off hand the terminal. I think it is number 54...someone will add the information, or go to the TST website. http://www.tstproducts.com/tranny_install.html

 

the Torque converter is wired up to a switch but that is not the problem. If I use the switch the TC works fine if I don't use the switch the computer takes care of it just like it should. the problem is in the Overdrive portion

 

try replacing the dash O/D button

 

If it's 5.6k it could be your problem. It should be 700-1k ohms

 

From the dodge book I am looking at it says middle 5K's is a little above 100* F, which puts it well above the 80* threshold for the tranny to shift into OD. On my chart 700-1K ohms would put it above 180* which probably above where the happy place is for the computer to think the tranny is. Correct me if I am wrong since I am looking at a crappy chilton/haynes manual and this is for a coolant sensor but a temp sensor should be a temp sensor reguardless.

To continue that thought it did this well before I even thought about putting in a resistor, could the sensor have been shot for a long time I suppose, but with the resistor it does seam to shift much better and doesn't do the lock unlock of the TC dance that they love to do.

 

could someone let me know how to test the solenoids, I figure stick a pin in the back of the connector drive it up to speed if a jumper wire off of that has continuity to ground it 'should' be getting a signal for OD right?

 

700 ohm was recommended to me by a diesel tranny expert. Lots of folks use a 1k because it's easier to acquire. It will only cost you 25¢ to see if the 5.6k is your problem.

I wouldn't even trust the page numbers in a chilton/haynes manual.