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Dodge Dakota Transmission Problems

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  • so i am going to pick up a 1997 dodge dakota. it belonged to my father and has ben sitting for about a year now. it needs oil every time it is to be ran ( or at least did when it ran last ) and my dad described the enginge as being "loose". i am not quite sure what that means... what do i need to do the get it "run-worthy"?? what kind of fluids and gaskets or what not do i need to check to ensure a good two hour drive back home??

    thanks toms!!

    ashers
  • dustykdustyk Posts: 2,926
    Ashers,

    A Dodge using motor oil, especially at a rate you describe, is very unusual. I suggest you inspect the engine for sources of a leak. Any two engine components that share a gasket are candidates for a leak, but because of the year I would first inspect the front and rear intake manifold gaskets. The valve cover gaskets would be my next suspect. Beyond that, there are no commonly found leak points on either the 3.9 V6 or the 318 V8.

    If this vehicle has sat dormant for a long period of time its possible you might have a rusted through oil pan. I once had a Chevy pick-up that experienced this...although it was a daily driver...but I have seen this on a few other trucks that realized long periods of non-operation.

    If you can't find a leak, then the engine is probably consuming the oil. Again, extremely unusual for this to be caused by poor piston ring sealing, but if this engine had ever been overheated badly it could have seriously scored cylinder walls. What is more likely is hardened valve guide seals, especially if this is a low mileage truck at this age.

    Regards,
    Dusty
  • jt8manjt8man Posts: 5
    Hello Dusty,

    I have a 2001 RT with 84k miles. It just started to have a problem getting into 2nd gear. Slow accel not as bad as hard accel where it revs really high and jumps, decel and it up shifts. Fluid level is good and clean. No other problems...Any suggestions before I take it to the shop??

    Nick
  • dustykdustyk Posts: 2,926
    Well, I'm pretty sure you have a 46RE transmission in the R/T and based on your description you are experiencing flair.

    Because of the age and miles and the time of year, here's my thoughts on possible causes in the order of probability:

    *Low fluid level. Make sure you check fluid level with the engine at full operating temperature, the vehicle on a flat, level surface, and the transmission in neutral.

    *Fluid level too high. Check for signs of bubbles (foaming) on the dipstick.

    *Transmission Throttle Position Lever sticking or binding, the throttle position lever return spring missing or broken, throttle linkage sticking/binding or out of adjustment. This is a very common problem on Mopars.

    *Low hydraulic pressure. This can be caused by a number of things, such as low fluid level, a partially clogged transmission filter or cooler lines, worn pump, a dirty or otherwise defective governor pressure valve, dirty/warped valve body, leaky internal seals or servos, etc.

    *Worn or slipping rear clutch, sticking rear clutch servo.

    I would recommend a Dodge technician check this out with a DRB3 scan tool first. There could be a defective Governor Pressure Sensor causing a false signal to the PCM. I'm not trying to make arbitrary conclusions here, but because you stated that even under light acceleration there is some flair, and the fact that this is an R/T, I am thinking this could be a rear clutch problem, especially if you've driven this vehicle hard and have not performed periodic transmission maintenance. However, 46REs are often thought to be in serious trouble when in fact the Throttle Position Lever is not working correctly, as noted above. For that matter, a lot of RE series problems are solved just be cleaning or replacing the valve body. A qualified and forthright Dodge technician is your best bet at this point, I think.

    Best regards,
    Dusty
  • dustykdustyk Posts: 2,926
    I keep forgetting to include the anti-drainback valve as a possibility:

    *Low hydraulic pressure. This can be caused by a number of things, such as low fluid level, a partially clogged transmission filter, cooler lines or anti-drainback valve, a worn pump, a dirty or otherwise defective governor pressure valve, dirty/warped valve body, leaky internal seals or servos, etc.

    Dusty
  • jt8manjt8man Posts: 5
    Thanks Dusty...Where would I find the Anti-drian back valve and the Throttle position sensor?

    NT
  • dustykdustyk Posts: 2,926
    NT,

    The Throttle Position Sensor is mounted to the left side of the throttlebody at a position in-plane to the end of the throttle shaft. There are three wires going to the sensor and two Torx screws are used to secure the sensor to the throttlebody that are easily removed.

    On 42 & 46RE transmissions, the Anti-drainback Valve is located in the transmission cooler outlet line near the radiator. On 545RFEs the anti-drainback valve is internal, however, Chrysler uses a small filter ahead of it to prevent the valve from becoming clogged.

    Best regards,
    Dusty
  • bpeeblesbpeebles Posts: 4,085
    After reading all of the appends about automatic xmissions... I am very glad that I saved $872 and just orderd the manual xmission. Plus, the automatic xmission needs to have frequent fluid/filter changes just to keep it going.

    I never had one lick of trouble with manual xmission and it shifts just fine every time I push the lever to another position. The way I figure it... I got about a year of free fuel AND no xmission problems. :D
  • Grew up working on VWs Porches and lately GM. What I know of Son's Dodge got mostly from Internet so be gentle please.

    1996 Dakota 3.9L 4WD LT235R15 tires on stock wheels. 75K miles. About 20% of the time on takeoff with more than the gentlest push on gas pedal, we get a very pronounced chatter, feels like a manual tranni clutch chatter or wheel hop. This will make your eyeballs dance. Backing off gas and the chatter stops. Have NOT tried to either floor it or leave gas down after chatter starts for fear of breaking something worse. Engine mounts seem OK in that revving in driveway, the engine moves maybe 1/4 inch. Shocks/springs seem OK as there in no lean and bouncing on the bumper gives one little bounce. I ran alongside the truck while Son drove looking for wheel hop, axle twist etc. Saw none, however, rear of transmission shook vertically about 1 inch, so replaced rear transmission mount. No effective change in the chatter. Seems to be a slight moan for about 2 seconds after chatter ends. Other than this, there are no issues with transmission operation at higher speeds or other gears. Previous owner is a friend, just drove to work and back, nothing exciting. All maintenance except tire changes was done at dealer. ATF looks/smells ok and is at the right level. Rubbing some between fingers feels more ‘grabbing’ than dexron/mercon, so that and dealer maintenance, I assume it is ATF+4. Planning on a drain and flush soon based on owners manual recommendations. Been reading past comments for last few weeks, saw nothing that seemed to fit, however any redirects to other posts will be gratefully accepted. Any/all comments and advice will be appreciated.

    Vr Karl
  • dustyndustyn Posts: 2
    I think I need to add transmission fluid to a manual transmission 1997 3.9L Dodge Dakota. The only problem is, I don't know where the mythical fill plug that the manual talks about actually is, other than the highly descriptive phrase "the side of the transmission." Does anyone have a diagram, or a better description for the location of this fill plug? Maybe the size of the wrench necessary to remove it? Thanks for your help.
  • Sorry, I cannot truly help as I have only seen one automatic. Start with figuring out what tranni you have; should be in your paperwork if you still have it or might could figure it out from the VIN. Quick Google shows you likely have either a standard duty 5 speed called a NV4500 or a medium duty 5 speed called NV3500.

    Google also says:

    "DRAIN AND FILL PLUG LOCATIONS
    The NV3500 fill and drain plugs are both located in the front housing. The fill plug is at the passenger side of the housing. The drain plug is at the bottom of the housing. "

    Also found a pic at http://nv4500transmissions.com/parts-diagrams/case-assembly.htm

    The home page is http://nv4500transmissions.com/general-information/index.htm This site has a lot of info on both trannies.

    Note you want to put in transmission OIL not FLUID these are TOTALLY different animals.

    Note that you will likely have to pump the oil up to the fill hole.

    Good luck and happy hunting.
    vr Karl
  • bpeeblesbpeebles Posts: 4,085
    I HIGHLY recommend that you put in RedLine MTL for fluid. It is perhaps the very best xmission fluid available on the planet. You will NEVER EVER have to change it again!

    I replaced the factory-fill with MTL after the 1st year of purchasing my Dakota new. The shifting was immeaditly better even when ambient temparture was well below 0F.

    As for your question about the fill plug.... as mentioned above, it should be pretty obvious on the side of the xmission case. There is nothing else there but metal.

    According to my factory shop manual, There were 2 manual xmissions used in Dakota (NV1500 and NV3500) The drain plug on BOTH of these is NOT a WRENCH. Instead it is an inverted drive. (sticks IN....not out!) The NV1500 used SQUARE drive and the NV3500 uses HEX drive.

    Just fill it up till fluid starts to ooze out of the fill hole. Approxamate capacities can be found on the internet. Just search for NV3500 and you will get 100s of hits.

    BTW: The NV3500 was also installed in 1000s of Chevrolet trucks too.
  • dustyndustyn Posts: 2
    Thanks for the help. I think I got it topped off.
  • dustykdustyk Posts: 2,926
    Actually, in 1996 Chrysler was using ATF+3. It is probable that if the transmission was maintenanced at a Chrysler-Dodge dealer they used ATF+3 up to about 2000. After that they likely used ATF+4. If the vehicle was maintenanced at somewhere other than a Chrysler-Dodge dealership, I would be very suspicious that Dexron-Mercon was used. With only about 4-5 quarts needed at a transmission filter change, many, if not most, independents used Dexron-Mercon. The ones I know did.

    Anyway, at first blush this sounds like a real bad case of torque converter chatter, but I would suspect you'd be getting some unusual noise along with it. Personally, I've never seen converter chatter that bad. I'm thinking this might be a problem in the clutch packs, or maybe a locked band or something. I'm afraid I can't offer you much advice on this one. A trip to a repair place is in order here, I think.

    If/when you get this fixed, stop back and let us know what resolved the problem.

    Best regards,
    Dusty
  • dustykdustyk Posts: 2,926
    I would add to make sure the vehicle is on a level surface before filling.

    Regards,
    Dusty
  • Dusty:
    Going to change fluid/filter next, so we will see what happens. Thinking out loud, wonder if the transfer case could be guilty? Will change fluid there also. Should check shift linkage as well

    My confusion with TC clutch is, why would it even be in the loop at 0-5 MPH? If it is not trying to engage, why would it chatter? Same goes for all clutches, none of them are doing anything. So, after going down this path, I think I have a clutch pack chatter while slipping due to wrong fluid, low pressure, varnish etc. etc. etc.

    Thanks
    Karl
  • dustykdustyk Posts: 2,926
    Well, the Torque Converter Clutch can lock-up and stay in this position, although this usually is accompanied by very harsh gear engagements and sometimes produces engine stall. The torque converter (TC) could contain an internal mechanical problem, such as loose or bent impeller or turbine blade(s), bad stator, etc., that can cause an imbalance or irratic fluid coupling that would feel like chatter or shutter.

    My suspicion, based only on the description without any other data, is the problem may be more related to clutch and band application. Could this be the result of expended or incorrect ATF? Yes. The symptoms you describe, although at the unusual end of severity, is common for all automatic transmission, including those from Ford and GM. In the past when I've been involved in a case where Dexron-Mercon was used in a Chrysler-built tranny, a common symptom was often described as "torque converter chatter/shutter." But not always.

    Is it worth trying to replace the fluid? Well, like most things there's a risk that a full fluid and filter change may not resolve the issue. ATF+3 or 4 is more than double the cost of Dexron (which is why a lot of shops use Dexron with a generic "friction modifier" instead of the real stuff). Is it worth any attempt to gamble that this will fix the problem and avoid a tranny shop? That is something only you can decide.

    My personal recommendation is to have a certified Dodge transmission technician check this out for you. His knowledge and specific experience with this transmission will, in my opinion, be invaluable, and possibly lower the total cost to you.

    Keep us posted.

    Best regards,
    Dusty
  • I would like to find out how to prevent my transmission from not shifting to overdrive when the temperature is below -20 celsius. Can someone tell me were this temperature sensor is and can it be relocated to a warmer location in the motor compartment? It has been below -20 for the last 6 weeks and I would like to drive my truck.
  • bpeeblesbpeebles Posts: 4,085
    I know the temp sensor on my 2000 Dak is under the battery.

    Do not forget that the signal from this sensor is used for MANY things besides shift-points on the automatic xmission.

    Some of the things which are tweaked based on ambient temp
    *) Engine starting sequencing and settings
    *) Charging voltage
    *) Idle speed
    *) fuel injection timing and amount
    *) spark ignition timing
    *) Shifting of xmission (automatic only)
    *) Emmissions equipment settings (EGR, EVAP...etc)
    *) Fuel pressure
    *) AirConditionor clutch. (will not enguage below specific temp.)

    Given the above facts, you may wish to reconsider relocationg the ambient temp sensor. Perhaps you need to better understand the PROBLEM you are having and work twards resolving that instead of relocating the ambient temp sensor.
  • dustykdustyk Posts: 2,926
    If you have a Dodge Dakota built after 1996, you can defeature the overdrive anytime by switching the OD off with the OD switch. The OD switch is a push button that is located at the end of the gearshift.

    The temperature sensor for Chrysler automatic transmissions are located inside the transmission and measure the temperature of the transmission fluid. On RE series transmission the temperature sensor is integral with the Govenor Pressure Sensor that is attached to the valve body.

    On RFE transmissions the transmission temperature sensor is part of the Transmission Range Sensor (TRS) that is attached to the transmission solenoid assembly.

    In general, Chrysler truck transmission (REs, RFEs) are designed to have no overdrive under 40 degrees F, and no torque converter lock up under 80 degrees F fluid temperature.

    Regards,
    Dusty
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