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  #1  
Old 01-10-2016, 04:22 AM
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Low mileage WJ 4.7 gearbox issue

Hi!

I have found a very low mileage 36k frist owner 1999 WJ 4.7 here that im interested in.
Car feels and looks as it was new only the gear changes from 2nd to 3rd are a bit sluggish.
No fault codes regarding transmission issues only the fan relay showed up.

Pretty sure the Transmission fluid is still the original 1999 stuff, could a fluid and filters change rectify the slow shifts or shall i walk away from the car?

Any help is appreciated making my decision to buy or run, thanks in advance!

[IMG]787509117209994 by guzz4v, on Flickr[/IMG]

[IMG]784509111033838 (1) by guzz4v, on Flickr[/IMG]

The marked stuff in the pic isnt original as far as i can tell

[IMG]20160101233053 by guzz4v, on Flickr[/IMG]

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  #2  
Old 01-10-2016, 06:37 AM
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Re: Low mileage WJ 4.7 gearbox issue

Such a low milage, i wouldnt think twice to buy it. Just have a look at the transmission fluid color and smell. If it smells burnt, then run away from it. Normally the fluid is light red in color (ATF+4), but it can become a bit brownish when used for a very long time. When its black, its not good.
New filters and fluid can do good, but some times do bad. New fluid has strong cleaning properties and can loosen and dislodge dirt, which could finally go to places you dont want it to.
The 5-45RFE transmission on this jeep is quite bullit proof though. This jeep came out in 1999 as a 4 speed, called the 45RFE, but in 2000 a software flash made it a 5 speed, by adding the 5th gear. If the flash was not done yet on this jeep, the stealer should still be able to do so.
Dont know if you are going to do the maintenance yourself, but during the transmission fluid change, you will have to check the accumulator plate from the valve body. It happened on several that the accumulator plate bolts came out and the accumulator plate bend, which will let the accumulator piston loosing most part of its function.
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  #3  
Old 01-10-2016, 06:43 AM
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Re: Low mileage WJ 4.7 gearbox issue

Thanks!!

Ill do everything myself, even did transmissions myself although not Jeep ones.
I found another one in Rio with only 16K miles from ne on the clock a 2000 model 4.7
ive read about the plate and if i buy it i will check it for sure.
Fluid seems okay no strange smell , i cama across an article stating that the cable could be out of adjustment too.
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Old 01-10-2016, 06:56 AM
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Re: Low mileage WJ 4.7 gearbox issue

The shift cable does the manual input to the manual valve insde the valve body. If it is misrigged, i would expect shift problems in all gears, not only one. But you never know ofcourse.
Maybe it just needs a quick learn, using the DRBIII scanner, to put all the CVIs back to basic settings, so that it can re-learn them quickly.
Regarding the accumulator plate i mentioned to you in the PM, it could be a good idea to install an aftermarket one, which is thicker and transmits the forces more evenly over the bolts. Transgo has this plate in its shiftkit.
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  #5  
Old 01-10-2016, 07:01 AM
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Re: Low mileage WJ 4.7 gearbox issue

Found this in a TSB, quick fix if im lucky but we will see.

The first step is to verify that the shifter linkage is adjusted properly and that the CHECK PRNDL fault
(code 2 is not present.
NOTE: A MISADJUSTED SHIFTER WILL NOT SET CODE 28. A MISADJUSTED SHIFTER
CABLE WILL HOWEVER CAUSE POOR 2-3 SHIFT QUALITY.
Qty Part Number Description

I will try to find the shift kit and plate but not easy here in these parts of the world for sure.
DRB scanner is a stealer only job is it
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Old 01-10-2016, 07:04 AM
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Re: Low mileage WJ 4.7 gearbox issue

Is this TSB for the 5-45RFE and not the 42RE?
The DRBIII is normally only dealer, but i have a transmission shop in Campinas, SP, who has the DRBIII.
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  #7  
Old 01-10-2016, 07:11 AM
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Re: Low mileage WJ 4.7 gearbox issue

Yeah its for the RFE models.


Ah ok, i will try to find a stealer here in Rio with the DRB to do the software flash 200 rpm less is alwyas a good thing to have.


Full TSB:

NO: 21-13-99
SUBJECT: 45RFE Drive Learn Procedure
DATE: Sep. 3, 1999
OVERVIEW:
This bulletin involves a drive procedure of the 45RFE transmission that the technician may use to have
the Transmission Control Module (TCM) learn the optimal shift parameters.
SYMPTOM/CONDITION:
The transmission may not shift smoothly. This condition may occur even after a Quick Learn procedure
has been completed.
DIAGNOSIS:
The 45RFE transmission adapts to its mechanical tolerances by learning the clutch volume indexes
(CVIs) as well as the duty cycle and other parameters that control shift quality. Performing a Quick
Learn will simply reset all transmission adaptive values to factory preset values and it will exercise the
transmission clutches to learn an approximate value for the clutch CVIs.
Quick Learn should not be used as a remedy for shift quality complaints. Quick Learn resets more than
70 learn parameters to their preset values and will require them to be relearned.
Quick Learn should only be used when a transmission has be replaced or overhauled, or when the
Transmission Control Module has been replaced or flashed. Once Quick Learn is performed, an initial
drive evaluation should be performed to determine if the transmission is shifting smoothly.
NOTE: VERIFY THAT ALL APPLICABLE TECHNICAL SERVICE BULLETINS FOR SHIFT
QUALITY HAVE BEEN PERFORMED PRIOR TO PERFORMING THE DRIVE LEARN
PROCEDURE.
EQUIPMENT REQUIRED:
DIAGNOSIS (cont.):
The first step is to verify that the shifter linkage is adjusted properly and that the CHECK PRNDL fault
(code 2 is not present.
NOTE: A MISADJUSTED SHIFTER WILL NOT SET CODE 28. A MISADJUSTED SHIFTER
CABLE WILL HOWEVER CAUSE POOR 2-3 SHIFT QUALITY.
Qty Part Number Description

1 CH6000 Scan Tool (DRB III
)

1 CH7000/7001 J1962 Cable
It is critical that the PRNDL code be OD when the shifter is in the OD position gate. Use the DRB III
to confirm that the correct code is present. If the shifter has a temporary code (T3 or T4) in the OD
shifter position, then this is the most likely cause for consistent poor 2-3 shift quality. If the linkage is
out of adjustment, then adjust the shifter linkage.
Perform the portion of the following 45RFE Drive Learn Procedure that will learn the specific shift
characteristic for the shift problem in question.
Procedure To Learn A Smooth 1


st Neutral To Drive Shift
:

Perform this procedure only if the complaint is for a delayed or harsh shift the first time the transmission
is put into gear after the vehicle is allowed to set with the engine not running for at least 10 minutes. Use
the following steps to have the TCM learn the 1st N-1 UD CVI.
NOTE: THE TRANSMISSION OIL TEMPERATURE MUST BE BETWEEN 80 - 110F (27 -
43C).
1. Start the engine only when the engine and ignition have been off for at least ten (10) minutes.
2. With the vehicle at a stop and the service brake applied, record the UD CVI while performing a
Neutral to Drive shift. During the shift, the UD CVI will temporarily show a different value which
is the 1st N-1 UD CVI. The 1st N-1 UD CVI account for air entrapment in the UD clutch that may
occur after the engine has been off for a period of time.
3. Repeat steps 1 and 2 until the recorded 1st N-1 UD CVI value stabilizes.
NOTE: IT IS IMPORTANT THAT THIS PROCEDURE BE PERFORMED WHEN THE
TRANSMISSION TEMPERATURE IS BETWEEN 80 - 110F (27 - 43C). IF THIS
PROCEDURE TAKES TOO LONG TO COMPLETE FULLY FOR THE ALLOWED
TRANSMISSION OIL TEMPERATURE, THE VEHICLE MAY BE RETURNED TO THE
CUSTOMER WITH AN EXPLANATION THAT THE SHIFT WILL IMPROVE DAILY
DURING NORMAL VEHICLE USAGE. THE TCM ALSO LEARNS AT HIGHER OIL
TEMPERATURES, BUT THESE VALUES (LINE PRESSURE CORRECTION VALUES) ARE
NOT AVAILABLE FOR VIEWING ON THE DRB III.
Procedure To Learn A Smooth Neutral To Drive Garage Shift:
Perform this procedure if the complaint is for a delayed or harsh shift when the transmission is put into
gear after the vehicle has had its first shift. Use the following steps to have the TCM learn the N-1 UD
CVI.
NOTE: THE TRANSMISSION OIL TEMPERATURE MUST BE BETWEEN 80 - 110F (27 -
43C).
1. Start the vehicle engine and shift to drive.
2. Move the vehicle forward to a speed of at least 10 MPH and come to a stop.
3. Perform repeated N-1 shifts at a stop while pausing in Neutral for at least 2-3 seconds and monitor
UD CVI volume until the value stabilizes. The value will change during the N-D shift. This is
normal since the UD value is different for the N-1 shift then the normal value shown which is
used for 4-3 coastdown and kickdowns. Perform repeated shifts in this temperature range until the
UD CVI value stabilizes and the N-1 shifts become smooth.
Procedure To Learn The 1


st 2-3 Shift After A Restart Or Shift To Reverse
:

Use the following steps t have the TCM learn the 1st 2-3 shift OD CVI.
NOTE: THE TRANSMISSION OIL TEMPERATURE MUST BE ABOVE 80F (27C).
1. With the vehicle engine running, select reverse gear for over 2 seconds.
2. Shift the transmission to Drive and accelerate the vehicle from a stop at a steady 15 degree throttle
opening and perform a 2-3 shift while noting the OD CVI. During the shift, a different value will
appear on the screen, which is the 1st 2-3 OD CVI.
3. Repeat steps 1 and 2 until the 1st 2-3 upshift becomes smooth and the 1st 2-3 OD CVI stabilizes.
Procedure To Learn A Smooth 2-3 And 3-4 Upshift


:

Use the following steps to have the TCM learn the OD and 4C CVIs.
NOTE: THE TRANSMISSION OIL TEMPERATURE MUST BE ABOVE 110F (43C).
1. Accelerate the vehicle from a stop at a steady 15 degree throttle opening and perform multiple 1-
2, 2-3, and 3-4 upshifts. The 2nd 2-3 shift following a restart or shift to reverse will be shown
during the shift as a value between the 1st 2-3 OD CVI and the normal OD CVI. Updates to the
normal OD CVI will occur after the 2nd shift into 3rd gear, following a restart or shift to reverse.
2. Repeat step 1 until the 2-3 and 3-4 shifts become smooth and the OD and 4C CVI become stable.
Procedure To Learn A Smooth 4-3 Coastdown And Part Throttle 4-3 Kickdown


:

Use the following steps to have the TCM learn the UD shift volume.
NOTE: THE TRANSMISSION OIL TEMPERATURE MUST BE ABOVE 110F (43C).
1. At a vehicle speed between 40 60 MPH, perform repeated 4-3 kickdown shifts.
2. Repeat step 1 until the UD volume becomes somewhat stable and the shift becomes smooth.
Procedure To Learn A Smooth 1-2 Upshift and 3-2 Kickdown


:

Use the following steps to have the TCM learn the 2C shift volume.
NOTE: THE TRANSMISSION OIL TEMPERATURE MUST BE ABOVE 110F (43C).
1. With a vehicle speed below 30 MPH and the transmission in 3


rd gear, perform multiple 3-2

kickdowns.
2. Repeat step 1 until the 3-2 kickdowns become smooth and the 2C CVI becomes stable.
Procedure To Learn A Smooth Manual 2-1 Pulldown Shift As Well As A Neutral To Reverse
Shift:
Use the following steps to have the TCM learn the LR volume.
NOTE: THE TRANSMISSION OIL TEMPERATURE MUST BE ABOVE 110F (43C).
1. With the vehicle speed around 25-30 MPH in Manual 2


nd, perform manual pulldowns to Low or

1st gear at closed throttle.
2. Repeat step 1 until the LR CVI become stable and the manual 2-1 becomes smooth.
Procedure To Learn A Smooth Neutral To Reverse Shift


:

Perform the following shifts.
NOTE: THE TRANSMISSION OIL TEMPERATURE MUST BE ABOVE 110F (43C).
1. With the vehicle at a stop, perform Neutral to Reverse shifts until the shift is smooth. An
unlearned Neutral to Reverse shift may be harsh or exhibit a double bump.
2. If any of the shifts are still not smooth after the clutch volume stabilizes, the an internal
transmission problem may be present.


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