need article from issue 11.

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Issue ll is no longer available, guess the data was wiped out. need issue 11, page 22c, letter excange, index subject of 'transmission shifts from OD to 4th and back again by itself. have a 95 3500 cummins. have been 'working' with the dealer for some time without success and this seems to address my proplem. i have also seen the forum threads. if someone can please send the article either by email ron. kurtz@mail. house.gov, fax at 202-226-6256 attn ron kurtz box 56, or mail ron kurtz, 1418 cottage st. , vienna, va 22180. thanks much.

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Ron,

I have the mag at home, but I won't be there until Friday. That article was probably about problems with the TPS (Trottle Position Sensor). There was quite a bit of discussion about that in several issues beginning with #11. If the TPS is not the problem, I will scan the article and send it to you when I get home. I had that problem with mine at that time. What is probably happening is that the TCC (Torque Converter Clutch) is locking and unlocking because of a bad signal from the TPS. The transmission is a three speed with OD being the 4th gear so it's NOT shifting from 4th to OD. If the locking and unlocking of the TCC is quick enuff you can experience a very violent jerking or banging when it happens. With mine it had to be when I was pulling my trailer using the cruise control up a grade just steep enuff so that the TCC would lock. This cause the RPM to drop a little and with the TPS sending a bad signal the CPM decided to unlock the TCC. This caused the conditions to return to the situation that resulted in a lockup. It would do that so rapidly that it would almost jar my fillings loose. My problem was very hard to reproduce so I dragged my travel trailer all over Humboldt Co. until I found a grade that was just right to cause it every time.

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Joe George
Eureka, CA

'95 2500 CC auto 4X4,3. 54,Combo EGT/boost guage,custom switch panel,PacBrake,TST #5,BD valve body,Automatic motorhome steps on both sides,Foldacover hard bed cover,Cummins chrome kit,Black steel grill guard,Front hitch receiver

 

[Archive]

I do not find the article you want on or near p. 22 of issue eleven. Sorry.
Joe

 

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I see it now Joe. Its at the top of page 22 under "HP UPRATE"

It decribes Bad andys` problem. Then it says to reference issue 10 Technical Topics for the fix.

Lemme dig up issue 10

[This message has been edited by HEMI®Dart (edited 12-12-2000). ]

 

[Archive]

I will post the important parts of :

"1994-1995 Automatic Overdrive Ghost"

This applies to post 94 trucks with auto transmission. You`re driving down the road about 60 mph, light load, in overdrive, torque converter locked, cruise control set. All of a sudden your engine revs and you wonder whats going on. Your O. D switch lights, your transmission shifts to third, your torque converter unlocks, and your cruise contol shuts itself off.

We discussed the overdrive ghost and a surging when the transmission shifts to overdrive and lockup under light load. Another symptom is a vibration or percieved engine miss at approximately 1100 rpm, as the torque converter lock-up would engauge. The condition occurs in 4th gear at speeds between 42 & 48 MPH. TSB 21-04-95 covers the problem. See the full TSB here: http://www.ecpe. vt. edu/~dfritz/technical/tsb95/21_04_95. HTM

Bob Patton answers:

We had problems with an "overdrive ghost" on a truck where I work. We had the same symptoms as you did with your truck. Finally, with the DRB 3 (scan tool) hooked up , the ghost appeared. On our truck, the problem was traced to a faulty transmission temperature sensor CONNECTOR. We had already replaced the transmission temperature sensor. The female connector was faulty, giving the DRB 3 false temperature readings and causing erratic shifting out of overdrive.

Hope this helps #ad




[This message has been edited by HEMI®Dart (edited 12-12-2000). ]