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2001 Dodge Ram 2500 Base 2dr Reg Cab 135 WB HD

2001 Dodge Ram 2500
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Rear Wheel Drive, Reg Cab 8'
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July 29, 2012, 2:36 pm

SUE WHIPP & TIM C
 

Question: Tranny slips in over drive.

After the tranny shifts into overdrive at approximately 53 mph the tranny will slip when going uphills. I will look down at 55mph and see the tach sitting at 1800rpm instead of the normal 1500rpm @55mph. When going up small grades, the tranny slipps - letting the rpm get up to as high as 2000rpm - without down shifting.
If it were the torque convertor, it would be consistant, doing it all the time. It dosen't do it all the time. If I hand shift the tranny through the gears, going to about 3000rpm before shifting - the tranny acts fine. Could this be an indication that I need to rebuild the valve body?
This is killing my gas mileage!


August 2, 2012, 10:20 am

Elizabeth K
Expert Mechanic

Are the rpms just high, or are you also simultaneously losing power? If you're not losing power, then the shift points aren't right and the tranny is not slipping. If it that's the case, check the TPS for proper signal range (it could be sending voltage spikes which cause the torque converter clutch (TCC) to unlock, and then look at the valve body.

If it is slipping, and only in OD, then the problem is the OD gear or the TCC.


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August 2, 2012, 12:20 pm

SUE WHIPP & TIM C
 

What is the TPS? When the tranny is working correctly, the engine rpm will be drawn down till the tranny shifts down or I ask for more power and it will down shift. The problem arises when I am simply cruising down the road. Yesterday, while driving on a straight and level road - no wind - at 55 in OD, I looked down and the rpm's were at 1900. I lift off the gas pedal for a second or 2 and then reapply the throttle - the rpms went back down to 1450-1500, where it should be.
This has been happening for 25,000+ miles - basically since the tranny was rebuilt by the dodge dealership. It has never worked right since. Prior to the rebuild I was getting over 15mpg hwy. After the rebuild, the best I can get is 13.6. As a commercial pilot this is driving me crazy.
The problem is that if I take it in to the dealership, they drive it around town and than tell me the tranny is fine. It takes weeks to get it in for an appointment - than it sits there for days. I have to find the solution.
In answer to you question - the engine dosen't seem to be loosing power. The motor is running nice, smooth and clean burning. Instead of using the power the engine is producing the tranny dosen't stay in od long enough to drag the rpm's down to the point where the tranny will shift.
The tranny fluid is like new, nice and clean and no odor of being burnt.
Help.


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August 2, 2012, 1:07 pm

Elizabeth K
Expert Mechanic

The TPS is the throttle position sensor, it is what tells the computer how far down your foot is on the accelerator pedal. Mechanically speaking, the tranny sounds like it's in good condition. While you may have a problem with the OD gear, I suspect there is a problem with the electronic controls that are telling the torque converter clutch when to lock up. It sounds like it's not locking up at all. That's just a guess without being able to see it or touch it, but it's worth verifying that the system is working.

Part of the problem you're having is with getting service in general. The dealership is not the place to be taking an 11 year old vehicle, and it does not sound like they're even giving very good customer service in the first place. Here's an article on that subject, and the reasoning behind why you should consider an independent shop:
http://bit.ly/PpqD8B


1/1 users found this helpful.

September 7, 2012, 1:47 am

SUE WHIPP & TIM C
 

The tranny is warranted by the dealership for 100,000 for parts. If I have another trany shop work on it it voids my warranty. I still have over 50,000 miles on the warranty.
I am disabled and live on my social security disability of $1450 a month as my sole source of income.
I got the 100,000 mile warranty for having them rebuid the tranny while it was covered by an extended warranty purchased with the vehicle.


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December 6, 2012, 12:44 pm

SUE WHIPP & TIM C
 

I found the problem with the assistance of Anthony's transmissions. The valve body needed rebuilt. The overdrive pressure valve was not holding enough pressure. There are several service bulletins that address the problem. Tony had to enlarge the original pressure hole plus drill 2 additional holes in the recommended locations.
Fuel mileage is now 14.5 - 16 mpg, vs. 11 mpg.


0/0 users found this helpful.

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