Engine/Transmission (1994 - 1998) Need Urgent Advice On 47RE malfunction!!!

[BBowers]

I have posted this recently, but I am updating my progress. Dad has a 96 ram CTD, 3500 dually 4x2. Bone Stock. It has 230k miles on it. He had the transmission rebuilt at 180k miles and got 30k out of it before the rebuild started screwing up by shifting in and out of OD going down the road, no load, flat ground. He had a larger converter put in that drags the engine idle down quite a bit at stoplights in gear(at the time of rebuild). He took it back to the guy who rebuilt it and he tore into it again and now has a total of 2500 bucks in it and it still won't work. He tried lifting the brake pedal with his foot to see if that helped. It did not help. He replaced the TPS. No help. Dodge says it needs a 500 dollar module/part to fix it and they said they couldnt garuntee that it would absolutely solve it. It now only shifts into OD cold. WHen warmed up, the transmission wont go into OD at all anymore. Fuel mileage, about 19 mpg with 3 gears. City and hwy combined, he never goes over 60mph, never towed anything! The converter is fine. It shifts the three remaining gears fine. I am at a dead end and so is he. I know we will kick ourselves when we find the problem, but I need any input I can get, this can't be the only one in America!!!!!

 

[Canadian Cummins]

Check threads here on trany temp sensor that looks like the most probable cause.

Some have put a 500 ohm resistor in the circut and fixed the problem.

CC

 

[DBraunig]

I would suspect the trans temp sensor also. it is mounted in the cooler line out of the trans on the driver side. if you get under the truck and look at the lines on the driver side of the trans, you can't miss it. there are other causes, but you cover most of them with the tps and brake switch mentioned in your post. Also the fact that it works cold should verify the o/d unit and piston seals, typically a seal failure shows itself more when cold and is prone to work with heat. i would be leaning toward the trans temp sensor also, this is fairly common and we have replaced a lot of them at the shop.

Hope this helps,



Dave.

 

[fox]

It may be elecrtrical noise from the alternator getting in the computer. This niose confuses the computer, it thinks it is told to unlock the converter, then relocks it.

You need a noise filter. DTT sells one. It works very well. Tell then to stop taking the trans apart, the problem is external.

DTT .

Sorry you had to learn this the hard way. $37 or so will fix it.