Last post on Nov 02, 2013 at 6:36 AM
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#945 of 1029 2005 dakota slips, hesitates and "thunks" at 10 mph when accelerating
Nov 12, 2011 (9:38 pm)
What would cause my 2005 Dodge Dakota to have these symptoms? Upon accelerating, at 10 mph, the transmission seems to make a "thunk" noise, I feel a mild jolt, and the shifting hesitates and then grabs. It has consistently been doing this for 2 weeks,and only at 10 mph. A transmission place said no codes came up when tested. They rebuilt the transmission at a huge cost. I just got it back 2 days ago, and the symptoms are coming back, though not as prominent. What could it be??????
#946 of 1029 Re: 2005 dakota slips, hesitates and "thunks" at 10 mph when accelerating [sheaster]
Nov 13, 2011 (10:13 am)
If this symptom existed before the transmission was rebuilt, it would appear the problem was not accurately diagnosed. Automatic transmissions will behave in a similar way if the fluid is low. There may be blockage keeping the fluid from flowing. Check the heat exchanger and related hoses.
#947 of 1029 Re: 2005 dakota slips, hesitates and "thunks" at 10 mph when accelerating [sheaster]
Nov 13, 2011 (2:23 pm)
This is a delayed shift from 1st to 2nd? What is the rpm when the shift
And they rebuilt the transmission? What exactly did they do to it?
The Dodge automatic is a complex transmission, with a oil pump,
2 planetary gear sets, a set of clutches, a set of bands and the servos
to operate them as well as a valve control body, a pressure governor,
variable force solenoid and sensor, and various shift valves inside
the valve control body of the transmission, so it's hard to give an
answer without observing operation on a hoist and monitoring transmission rpm and fluid pressure at the test ports.
For 1-2 shifting to take place in D, there are several components of the
transmission fluid pump,
governor pressure is a variable pressure input to the valve body and is one
of the signals that a shift is necessary.
Different sets of clutches and bands are operated or released.
There is also a TCC (torque convertor clutch solenoid on the valve body,
but I don't think this is involved yet,
in the 1-2 shifts which involve:
25 to 70psi being available at the valve body
1-2 shift valve, 1-2 shift control valve, 1-2 shift regulator valve.
Lockup valve and lockup solenoid
lockup timing valve.
If you are experiencing harsh shifts 1-2, or 2-3 or 3-4, it could be
attributed to a lockup solenoid malfunction. Did they do pressure test
at the test ports on the transmission?
If it's due to a solenoid malfunction which is in the valve body, the pan
has to come off and the valve body removed to replace the solenoid
The transmission shift points are controlled by the PCM based on a
appropriate rpm, and transmission fluid pressure feedback to the PCM.
It operates a variable force solenoid, TCC solenoid, and 3-4 shift (O/D
The variable force solenoid is operated by the PCM in D when it receives
the appropriate transmission output shaft rpm (TSS) sensor and the appropriate pressure in the transmission pressure sensor to facilitate PCM gear shifting for you.
If the PCM shift points are not happening, then fluid pressure
will build up and hard shift, (rather than a softer modulated electronic solenoid shift) will occur.
The TSS (transmission speed sensor on the transmission sends transmission output shaft rpm to the PCM which will control the
shift program points.
It could also be a sensor or a solenoid acting up and not generating a
code. I had a similar harsh shifting problem/high shift rpm until I
replaced the TSS. Transmission shifting returned to normal after
it was changed, and that was all that was done to my transmission.
#948 of 1029 Odd sound when driving after truck sits for a little while
Nov 21, 2011 (1:36 pm)
I have a 2003 Dodge Dakota SLT Quad cab with the 4.7 V8.
The problem I've been having is when I drive off either first thing in the morning (or whenever the truck has been sitting for about 10 mins or longer) it seems the truck is sluggish driving down the street for a block or two and it makes it sound like the engine is "louder" then usual (compared to when I first got the truck) once I've driven for that amount of distance or so, the louder "engine" sound smooths out to a normal sound and all is good afterwards. This problem persists longer, the longer the truck has sat, or the temperature outside. I thought that maybe I needed the tranny filter changed, did that several months ago, then I decided to get the tranny flushed, and for the hell of it, changed the filter again. (200$)
The first time I had the filter changed I could notice a little bit of difference, it was still doing it, but not as bad, but it progressively got back to where it was again. Just had the tranny flushed and filter changed, but it has made no difference as far as I can tell. The guy who did the tranny flush looked at the fluid and didn't see anything in it showing any catastrophic problems but obviously I need to get the problem fixed, because I'm figuring (I'm no car guy if you haven't figured it out) that its not pumping my tranny fluid right or something and eventually I'm going to have a really really expensive problem. I've noticed other guys on the forums have had their computer's read, I haven't had this done, I have had a engine light on, but the last time I checked it was for a damn gas cap sensor (changed gas cap, still would come on), I guess I should have it checked again.
Any input would be appreciated guys, thanks.
#949 of 1029 Re: Odd sound when driving after truck sits for a little while [steaknshake83]
Nov 21, 2011 (1:54 pm)
Sounds like the transmission is staying in 1st longer than it should? Nothing specific to offer, but my 2005 (same engine as yours) does the same thing, but usually only when cold. The tranny operates normally after the first up shift, usually within a block or so.
#950 of 1029 Re: Odd sound when driving after truck sits for a little while [steaknshake83]
Nov 22, 2011 (9:07 am)
The louder sound which smooths out, after the truck has travelled a little
distance is more than likely the thermostatic viscous clutched fan. It will
turn faster initially (when cold)and make more noise, until the viscous fluid decouples
the fan from the fan pulley and the fan starts to freewheel.
The only way you can tell if it's an actual transmission problem is watching
the RPM at the shift points (1->2) and (2->3) on the tach.
If the shift points (set by the PCM) appear to be within a normal range,
then more than likely the transmission is shifting gears. If the RPMs
shoot way up in 1st gear or 2nd gear, then you would have something
to be concerned about.
If that happens you would get hard shifts which are very noticible.
In those cases, it's either the TSS (tranmission speed sensor) or
possibly the TPS (throttle position sensor).
#951 of 1029 Re: Transmission slips only when I make a left turn!?! [casey35]
Nov 27, 2011 (6:11 pm)
My 98 dakota does the same thing ,,Just wondering if you ever found out what caused your problem ! Only left hand turns !
#952 of 1029 2004 dakota / automatic
Nov 30, 2011 (11:19 am)
I have a 2004 Dodge Dakota 4x4 . The transmissions is acting up . Its shifts into higher gears too soon . When under 45 , I have to keep the overdrive off . Sometimes when it does thyere is a little chatter , but seems because the shift was way to early and the engine rpm's are to low . When it does shift tho it is a smooth shift . Any ideas or will this be a complete rebild ?
#953 of 1029 Re: 2004 dakota / automatic [eddierads]
Nov 30, 2011 (8:15 pm)
" Its shifts into higher gears too soon . When under 45 , I have to keep the overdrive off . Sometimes when it does there is a little chatter , but seems because the shift was way to early and the engine rpm's are too low "
By "shift's into higher gears too soon"..I would presume that the PCM
electronic shifts are taking place, rather than higher pressure induced
"hard shifts" done at higher rpms.
There is a TPS throttle position sensor located on the LEFT (driver's)side of the throttle body.
It connects to the throttle shaft (butterfly valves) and feeds back
information to the PCM on what the throttle is doing at the time.
The second sensor associated with shifting gears, is the Governor pressor
sensor located on the transmission itself. This sensor tells the PCM (computer)
what the fluid pressure is in the valve body (the part of the transmission that
has the fluid activated shift valves to operate the clutches and bands for
the dual planetary gear set and the separate overdrive unit.
The third sensor is the TSS, which tells the PCM the rpm of the o/p shaft of
the transmission itself.
The shift program is learned by the PCM from your driving habits and feedback
from these sensors..which need to be checked out first before considering
an expensive transmission rebuild.
The "chatter" you are referring to..could be the engine "shuddering" because
of the higher gear loading on the engine is too much for the rpm and torque
of the engine at the time....or an actual internal clutch inside the Dodge
transmission chattering because it is slipping on it's friction plates..or
low fluid pressure being delivered by the transmission fluid pump.
There are test ports for determining transmission fluid pressure that a transmission shop can do (with the vehicle running on a hoist) to see
if it's fluid pressure, or worn clutches...or even a bad sensor.
Generally speaking, the transmission should shift from 1st gear to second
gear electronically around 2200 rpm..if everything, including the sensors
mentioned are working correctly.
Shifting from 2nd to 3rd gear is about the same or slightly lower rpm
(1800 to 2000 rpm)
Shifting from 3rd gear to the O/D (4th gear) is around 1800 and then once
in O/D,the engine rpm drops down to about 1500..if you are under 50mph.
The rpm will increase with speed.
#954 of 1029 Re: 2005 Dodge Dakota Quad Cab [carverman]
Dec 05, 2011 (11:49 am)
I suppose I am not good at explaining. But here today it did it once again. I will try and explain todays actions. It is cludy and 40 degrees today. I left for lunch and got onto the highway and it accelerated to 45 MPH at 3700 rpm. When I released the gas pedal it downshifted and felt like "rear end" locked up. Once again as previously noted it might not have locked the rearend up but thats how it feels. Almost like a chevy drive shaftclanks when u-joints going out. That abript kind of feel. So I gave it the gas again so to not get run over from behind and the RPMs climbed up once again and would only go about 50 mph. It bucked and bronced on me and then the engine light came on. I took it by the Ford house, where I bought it used and the mechanic ran a generic test on it and it showed that the MAF/MAP sensor was faulty. He suggested I go by the Dodge house to have them run a diagnostic test on it. They quoted me(Dodge) 130.00 to test the problem. I did NOT get it done as for it is too close to the holidays and well 130.00 is alot. I stopped by the local Auto Parts store and they pulled a TPS sensor code. I went ahead and bought one since its only 20.00. Have yet to install it.When I got BACK in the truck and headed back to work I noticed the engine light was OFF and then the cruise button stopped working. This also happened last year around the wreck. SO in short I think it may have something to do with the transmission ie the case aluminum may be so cold that something is sticking in it until it reaches a warmer temp?? That is just a educated guess on my end. I DO like the info you gave me and I am sorry I did not explain well enough the last go round. See what this info throws your way.