Last post on Nov 02, 2013 at 6:36 AM
You are in the Dodge Dakota-2010 and older
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Dodge Dakota, Truck
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#548 of 1029 Re: 2002 dakota 4x4 sport overdrive kicking out [02flhtc]
Mar 01, 2009 (12:07 pm)
How many miles on this transmission and have you ever performed a transmission maintenance?
I would first replace the transmission filters, both the Primary Transmission Filter and the Cooler Return filter. The Cooler Return Filter looks like a very small spin-on engine oil filter. Chrysler became extremely sensitive to debris management with the RFE transmission series. It incorporates an exceptionally fine filter media that traps debris down to 6 micron. Unfortunately, this is a high efficiency filter with a relatively low capacity and it can clog easily if there is a lot of debris in the fluid.
Also, if its ever been replaced, there were some Cooler Return Filters that were bad for a while.
If this does not solve the problem, try disconnecting the battery for two minutes and go through a relearn. If that doesn't work, have a Dodge technician put a DRB3 diagnostic tool on it. You may have lost the shift algorithm or need a flash update.
#549 of 1029 Re: 2002 dakota 4x4 sport overdrive kicking out [ndc]
Mar 01, 2009 (12:12 pm)
Yeah, I don't think 4C should be zero, but that could be caused by something else.
I'm sorry I'm getting this on Sunday. Let me get back to you.
#550 of 1029 Dodge Trans issues
Mar 01, 2009 (7:14 pm)
I have spoken with a few mechanics and they all agree the Dodge 45RFE is a solid transmission. But if you goto some of the shops they will say you need a tranny straight up. From what I have read, the TPS can be a issue, also computers become corrupted and need to be reflashed, about $100. The other issue is the transmission input and output sensors and there are 2 filters that need to be replaced when doing the trans service. There's a flat one and a spin on inside. I have done changed everything but the two input/output sensors. Each time the trany has improved but still issues, hoping the last 2 sensors do it. Will replace this week
#551 of 1029 Re: Dodge Trans issues [rx2man]
Mar 01, 2009 (7:58 pm)
It's unfortunately true, a lot of shops will automatically turn you into a rebuild. But just like for doctors, one should get a second opinion. RFEs just don't have that many problems, and they break even less. My Dodge transmission tech. has never had to take one down. Any problems have been repaired without transmission removal.
There was a loose accumulator plate problem on some early versions, which would cause the plate to eventually bend, I've heard of a couple of marginal sensors, and yes, the Cooler Return Filter can get clogged very quickly on these trannies. But all these problems can be resolved on the vehicle.
#552 of 1029 Re: 2002 dakota 4x4 sport overdrive kicking out [ndc]
Mar 03, 2009 (5:50 pm)
Based on your numbers there is something definitely wrong. The Low Reverse clutch pressure is too high, the 2C clutch and Overdrive clutch pressures seem within range. I consulted with a Dodge tranny tech and he thinks the Underdrive clutch pressure is too low.
The 4C clutch pressure doesn't make any sense since you say that after being warmed up it drives okay. Basically at zero it's telling you that the 4C clutch requires absolutely no pressure to apply which doesn't make sense if it drives. This could be an erroneous reading I suppose.
The rebuilding quote seems unreasonably high. Heck, you could probably buy a brand new complete transmission across the parts counter for nearly that price. Unless this transmission's been abused, I would suspect that most of the hard components are still good (panetaries, shafts, etc.). You might need clutches or maybe a valve body, but that would be just speculation. You really don't know until you pull it apart.
You know, it might pay to get a second opinion.
#553 of 1029 Re: 2002 dakota 4x4 sport overdrive kicking out [dustyk]
Mar 03, 2009 (6:53 pm)
Thanks for all the info. I think the first thing I'll do is get a second opinion.
I might try changing a few sensors just to make myself feel better about a rebuild. I guess it just doesn't seem right that its fine after it warms up.
I'll be sure to keep you updated to the problem.
#554 of 1029 Re: 2002 dakota 4x4 sport overdrive kicking out [ndc]
Mar 04, 2009 (6:02 pm)
The 545RFE has been out better than eight years and in that time I've heard of one major failure, and that was a broken sun gear on a 2000 Cherokee. I asked my Dodge guy the other day and another transmission tech. yesterday if they've seen any 545RFEs apart. I figured that after eight years you'd start seeing a few. Neither have had an opportunity to do a rebuild, in fact both said they've never removed one from a vehicle. Anything that's gone wrong was correctable either with a reflash or pulling the pan.
I've heard of two sensor failures on a 545RFE, both on the net. As mentioned before, there was a bent accumulator plate issue, but that was assembly related and fixed a long time ago. The guys I've talked to seem to think most problems are fluid related as each said the most they taken apart were valve bodies.
I did think about your symptom and the goofy no pressure on the 4C clutch. I don't know if this is possible with this design, but maybe the 4C clutch is hung up. I can't think of another reason to get a zero pressure reading other than the reading is false, or you have a bad computer. I'd be tempted to erase the PCM and reflash the computer just to see what the effect would be..
By all means, let us know what the end result is.
#555 of 1029 1988 Dakota no overdrive or lockup below 40F
Mar 04, 2009 (9:51 pm)
I have a 1988 dakota 4x4 with a 3.9L and the auto overdrive transmission. The truck has 74,000 original miles on it. I purchased it off of an elderly gentleman that could not drive no longer. I have gave it a complete tune up, changed the trans fluid (ATF+4), and replaced the coolant temperature sensor.
On to the problem. When the temperature is less than 40 degrees outside the truck will not shift into overdrive or use lockup from what I can tell. I have a 15 mile commute so there is plenty of time to get the truck fully warmed up. The trans shifts perfectly otherwise. You can feel all of the gears engaging and lockup when the temperature is warmer.
I have read through all 56 pages looking for a similar problem but have found none. Hopefully somebody here can head me in the right direction to cure this problem. Thanks.
#556 of 1029 Re: 1988 Dakota no overdrive or lockup below 40F [jvinzant]
Mar 07, 2009 (5:23 am)
By design the transmission will not shift into overdrive or go into converter lock-up until the transmission fluid temperature reaches a certain temperature on newer Mopars, usually at 80 degrees F. Your '88 probably has a A518 transmission and I'm not sure it had this design feature, but I don't believe it did. If it did, there is a fluid temperature sensor inside the transmission.
Have you tried replacing the Throttle Position Sensor? Have you checked the Throttle Valve Cable adjustment?
#557 of 1029 Re: 1988 Dakota no overdrive or lockup below 40F [jvinzant]
Mar 07, 2009 (10:08 am)
Well, I'm pretty sure that 1988 was the first year of the four-speed automatic in the Dakota. Whether this was a A518 or an A999 I'm not sure.
I consulted some experts this morning and there was some discussion about this problem. The electronic governor was not adopted until the following year (1989), however a Dodge transmission tech. believes that lock-up was prevented by temperature on the four-speed RWD transmissions before the advent of the electronic governor.
Look for a sensor in one of the transmission lines (it should be the return line). This would be mounted directly to the steel tubing and use two wires. I'm not certain about this, but my memory is probably the weakest of the two consulting technicians. (It's definitely the oldest!!!) I don't recall a sensor like this used in a Dodge application.
If there is no temperature sensor in one of the transmission lines going to the radiator, collectively we are drawing a blank on this one. None of us can ever remember a condition like the one you are describing.
I think lock-up was controller directly by the PCM in those days, which means it operated the lock-up solenoid. There is a temperature circuit in the older PCMs used for some emission related operations. Maybe that is where the problem. From a pure hydraulic standpoint, I don't have much to offer as far as suggestions except what I've already mentioned.