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  #1  
Old 09-03-2010, 10:59 AM
Mic Shaw Mic Shaw is offline
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Default 2001 Ram1500 5.2 L Transmission shifting problems

I have a 2001 Ram 1500 5.2 L Auto and have run into an intermittent shifting problem that has only happened when I am hauling my 24 ft 5th Wheel Trailer.

The problem has shown up after going over a piece of rough road at slow speed and once it appeared after the vehicle going into passing gear (Downshift).

1. The transmission will down shift early and down shift two gears (2nd Gear) on a grade where it would normally only drop one gear.
2. The transmission will then hang in second gear for an excessive period.
3. It will not up shift even if I let off the throttle on the down slope.
4. When it decides to shift (throttle on or off) it shifts very harshly on the up shift to 3rd and again when going into 4th.
5. An error code P1763 showed up on my scanner but did not give me a check engine light.
This condition will disappear as I drive and the truck will operate very normally. Previous to the problem I had the fluid and filter changed and added Lucas transmission conditioner (just normal maintenance thing). THE EXPERIENCE I've HAD WITH TRANSMISSION SHOPS IN OUR AREA IS THAT ALL THEY WANT TO DO IS OVERHAUL THE TRANSMISSION AND ARE NOT INTERESTED IN FIXING A PARTICULAR PROBLEM WITH THE TRANSMISSION. I don't mind paying for an overhaul if necessary but hate to pay for unnecessary repairs.
Has anybody any light to put onto this problem.

Last edited by Mic Shaw; 09-03-2010 at 11:00 AM. Reason: corrections
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Old 09-03-2010, 07:20 PM
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Old 09-04-2010, 01:47 AM
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Has the filter been changed and the fluid flushed, not just drained and filled? What color is the fluid? What does the fluid smell like?
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Old 09-04-2010, 01:54 AM
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I am not an experienced automatic trans guy, but based on the symptoms and the code, I'd be looking at the throttle position linkage (AKA kick-down linkage) for binding. The code is complaining about high pressure, and the hard shifts would support that. If the linkage sticks in the WOT position, the trans would be building as much pressure as possible thinking that you have your foot in it. This will increase the shift severity, as well as delay it to higher RPMs. Just a thought.....
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Old 09-16-2010, 04:21 PM
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Default shifting problems

having the same problems

truck to the garage 3 times, filters, oil changed, fuel injection purging, transmission fluid replaced etc, works great a short time

will be taking it to a friend mechanic this time, done some research will have him test the throttle position sensor, worth a try
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Old 09-16-2010, 09:02 PM
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Governor pressure issue . Could be a defective governor pressure sensor .
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Old 09-17-2010, 09:19 PM
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Default shifting problems

thank you, any help is appreicated
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Old 09-24-2010, 03:47 AM
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you are right it was the governor pressure sensor, replaced and so far shifting like a new truck! only out twice but so far no signs of a problem
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Old 09-24-2010, 04:27 AM
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Real good news! Always like to here the success stories.

WTG Tom!
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Old 09-25-2010, 09:47 PM
Mic Shaw Mic Shaw is offline
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Default Possible solution?????

Had the truck to a transmission man yesterday. put his Snap On vehicle scanner/analyzer on it to look for faults (no faults showed up) and then was checking out some other things and low and behold my alternator voltage was only putting out 12.8 V with the heater motor/lights and brakes on. He believes that when I have my 5th wheel on I probably would and did have my lights on/air conditioning on while on the road. When I applied my brakes and engine RPMs was down and my electric brakes were activated on the trailer cause the alternator output to dip below 12.2 V which would cause the computer to shut down and as a result the transmission defaults to second gear. With the tranny hung in second it would give me high governor pressure and an erratic hard shift. He said then the computer would re-flash after a period of time and all would return to normal. His explanation seemed to match up and make sense to what conditions were when I was having the problem. He thinks that the voltage regulator pac on my generator has failed. Does this all make sence to anyone? Anybody know what the standard alternator amp rating is on a 5.3l auto w/air?

Last edited by Mic Shaw; 09-25-2010 at 09:52 PM.
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