transmission help
#11
01-04-2011, 10:43 PM
THE ULTI-MOD
to the best of my knowledge the first computer controlled transmission offered in these trucks (speaking about durangos) was the 45rfe which was put behind the 4.7 in 00-02, which was replaced in the VERY late model year 02 trucks as well as 03+ w/ the 545rfe(the first 5 speed transmission offered in these trucks) the 42, 44 and 46 re series of transmissions were controlled by the internal pressure and shift using a band system, im not 100% on the workings, but from what i understand the computer does little more than monitor the running of these transmissions and the shift into OD, hydra or master tech will have much more detailed information for you
#12
01-05-2011, 09:59 AM
to the best of my knowledge the first computer controlled transmission offered in these trucks (speaking about durangos) was the 45rfe which was put behind the 4.7 in 00-02, which was replaced in the VERY late model year 02 trucks as well as 03+ w/ the 545rfe(the first 5 speed transmission offered in these trucks) the 42, 44 and 46 re series of transmissions were controlled by the internal pressure and shift using a band system, im not 100% on the workings, but from what i understand the computer does little more than monitor the running of these transmissions and the shift into OD, hydra or master tech will have much more detailed information for you
#13
01-05-2011, 10:51 AM
THE ULTI-MOD
the 42, 44 and 46 are all very similar inside and will bolt up to the same engines and all function as below
if im reading that correctly (from the factory issues service manual) the only part of the 46re controlled by the PCM is the torque converter clutch please feel free to point out anything i may have missed, but the way i read that is that the internals of the transmission are controlled by varying hydraulic pressure
DESCRIPTION
The 46RE (Fig. 1) is a four speed fully automatic
transmissions with an electronic governor. The 46RE
is equipped with a lock-up clutch in the torque converter.
First through third gear ranges are provided
by the clutches, bands, overrunning clutch, and planetary
gear sets in the transmission. Fourth gear
range is provided by the overdrive unit that contains
an overdrive clutch, direct clutch, planetary gear set,
and overrunning clutch.
The transmission contains a front, rear, and direct
clutch which function as the input driving components.
It also contains the kickdown (front) and the
low/reverse (rear) bands which, along with the overrunning
clutch and overdrive clutch, serve as the
holding components. The driving and holding components
combine to select the necessary planetary gear
components, in the front, rear, or overdrive planetary
gear set, transfer the engine power from the input
shaft through to the output shaft.
The valve body is mounted to the lower side of the
transmission and contains the valves to control pressure
regulation, fluid flow control, and clutch/band
application. The oil pump is mounted at the front of
the transmission and is driven by the torque converter
hub. The pump supplies the oil pressure necessary
for clutch
The 46RE (Fig. 1) is a four speed fully automatic
transmissions with an electronic governor. The 46RE
is equipped with a lock-up clutch in the torque converter.
First through third gear ranges are provided
by the clutches, bands, overrunning clutch, and planetary
gear sets in the transmission. Fourth gear
range is provided by the overdrive unit that contains
an overdrive clutch, direct clutch, planetary gear set,
and overrunning clutch.
The transmission contains a front, rear, and direct
clutch which function as the input driving components.
It also contains the kickdown (front) and the
low/reverse (rear) bands which, along with the overrunning
clutch and overdrive clutch, serve as the
holding components. The driving and holding components
combine to select the necessary planetary gear
components, in the front, rear, or overdrive planetary
gear set, transfer the engine power from the input
shaft through to the output shaft.
The valve body is mounted to the lower side of the
transmission and contains the valves to control pressure
regulation, fluid flow control, and clutch/band
application. The oil pump is mounted at the front of
the transmission and is driven by the torque converter
hub. The pump supplies the oil pressure necessary
for clutch
The 46RE (Fig. 1) is a four speed fully automatic
transmissions with an electronic governor. The 46RE
is equipped with a lock-up clutch in the torque converter.
First through third gear ranges are provided
by the clutches, bands, overrunning clutch, and planetary
gear sets in the transmission. Fourth gear
range is provided by the overdrive unit that contains
an overdrive clutch, direct clutch, planetary gear set,
and overrunning clutch.
The transmission contains a front, rear, and direct
clutch which function as the input driving components.
It also contains the kickdown (front) and the
low/reverse (rear) bands which, along with the overrunning
clutch and overdrive clutch, serve as the
holding components. The driving and holding components
combine to select the necessary planetary gear
components, in the front, rear, or overdrive planetary
gear set, transfer the engine power from the input
shaft through to the output shaft.
The valve body is mounted to the lower side of the
transmission and contains the valves to control pressure
regulation, fluid flow control, and clutch/band
application. The oil pump is mounted at the front of
the transmission and is driven by the torque converter
hub. The pump supplies the oil pressure necessary
for clutch/band actuation and transmission
lubrication......
The application of each driving or holding component
is controlled by the valve body based upon the
manual lever position, throttle pressure, and governor
pressure. The governor pressure is a variable
pressure input to the valve body and is one of the
signals that a shift is necessary. First through fourth
gear are obtained by selectively applying and releasing
the different clutches and bands. Engine power is
thereby routed to the various planetary gear assemblies
which combine with the overrunning clutch
assemblies to generate the different gear ratios. The
torque converter clutch is hydraulically applied and
is released when fluid is vented from the hydraulic
circuit by the torque converter control (TCC) solenoid
on the valve body. The torque converter clutch is controlled
by the Powertrain Control Module (PCM). The
torque converter clutch engages in fourth gear, and
in third gear under various conditions, such as when
the O/D switch is OFF, when the vehicle is cruising
on a level surface after the vehicle has warmed up.
The torque converter clutch will disengage momentarily
when an increase in engine load is sensed by
the PCM, such as when the vehicle begins to go
uphill or the throttle pressure is increased. The
torque converter clutch feature increases fuel economy
and reduces the transmission fluid temperature.
Since the overdrive clutch is applied in fourth gear
only and the direct clutch is applied in all ranges
except fourth gear, the transmission operation for
park, neutral, and first through third gear will be
described first. Once these powerflows are described,
the third to fourth shift sequence will be described.
transmissions with an electronic governor. The 46RE
is equipped with a lock-up clutch in the torque converter.
First through third gear ranges are provided
by the clutches, bands, overrunning clutch, and planetary
gear sets in the transmission. Fourth gear
range is provided by the overdrive unit that contains
an overdrive clutch, direct clutch, planetary gear set,
and overrunning clutch.
The transmission contains a front, rear, and direct
clutch which function as the input driving components.
It also contains the kickdown (front) and the
low/reverse (rear) bands which, along with the overrunning
clutch and overdrive clutch, serve as the
holding components. The driving and holding components
combine to select the necessary planetary gear
components, in the front, rear, or overdrive planetary
gear set, transfer the engine power from the input
shaft through to the output shaft.
The valve body is mounted to the lower side of the
transmission and contains the valves to control pressure
regulation, fluid flow control, and clutch/band
application. The oil pump is mounted at the front of
the transmission and is driven by the torque converter
hub. The pump supplies the oil pressure necessary
for clutch/band actuation and transmission
lubrication......
The application of each driving or holding component
is controlled by the valve body based upon the
manual lever position, throttle pressure, and governor
pressure. The governor pressure is a variable
pressure input to the valve body and is one of the
signals that a shift is necessary. First through fourth
gear are obtained by selectively applying and releasing
the different clutches and bands. Engine power is
thereby routed to the various planetary gear assemblies
which combine with the overrunning clutch
assemblies to generate the different gear ratios. The
torque converter clutch is hydraulically applied and
is released when fluid is vented from the hydraulic
circuit by the torque converter control (TCC) solenoid
on the valve body. The torque converter clutch is controlled
by the Powertrain Control Module (PCM). The
torque converter clutch engages in fourth gear, and
in third gear under various conditions, such as when
the O/D switch is OFF, when the vehicle is cruising
on a level surface after the vehicle has warmed up.
The torque converter clutch will disengage momentarily
when an increase in engine load is sensed by
the PCM, such as when the vehicle begins to go
uphill or the throttle pressure is increased. The
torque converter clutch feature increases fuel economy
and reduces the transmission fluid temperature.
Since the overdrive clutch is applied in fourth gear
only and the direct clutch is applied in all ranges
except fourth gear, the transmission operation for
park, neutral, and first through third gear will be
described first. Once these powerflows are described,
the third to fourth shift sequence will be described.
#14
01-05-2011, 01:24 PM
Beats me...That's whi I let the pros build my trannys.
I know on the 46RE that was in my Dakota, the only way to get it to ****f where I wanted to under WOT was by my flashing the PCM, so I guess the PCM does control the shifting... Evenhad to solder a resistor into one of the harnes in valve body to fool the PCM.
Whensomeone ditches the EFI and the PCM all together, they have to go to a manual valve body or go to an RH, the RE won't shift.
I have a 727 with a manual valve body, I had to flash the auto out of the PCM.
REs are PCM controlled, to what extent I don't know.
I know on the 46RE that was in my Dakota, the only way to get it to ****f where I wanted to under WOT was by my flashing the PCM, so I guess the PCM does control the shifting... Evenhad to solder a resistor into one of the harnes in valve body to fool the PCM.
Whensomeone ditches the EFI and the PCM all together, they have to go to a manual valve body or go to an RH, the RE won't shift.
I have a 727 with a manual valve body, I had to flash the auto out of the PCM.
REs are PCM controlled, to what extent I don't know.
#15
01-05-2011, 06:07 PM
Hall Of Fame
Beats me...That's whi I let the pros build my trannys.
I know on the 46RE that was in my Dakota, the only way to get it to ****f where I wanted to under WOT was by my flashing the PCM, so I guess the PCM does control the shifting... Evenhad to solder a resistor into one of the harnes in valve body to fool the PCM.
Whensomeone ditches the EFI and the PCM all together, they have to go to a manual valve body or go to an RH, the RE won't shift.
I have a 727 with a manual valve body, I had to flash the auto out of the PCM.
REs are PCM controlled, to what extent I don't know.
I know on the 46RE that was in my Dakota, the only way to get it to ****f where I wanted to under WOT was by my flashing the PCM, so I guess the PCM does control the shifting... Evenhad to solder a resistor into one of the harnes in valve body to fool the PCM.
Whensomeone ditches the EFI and the PCM all together, they have to go to a manual valve body or go to an RH, the RE won't shift.
I have a 727 with a manual valve body, I had to flash the auto out of the PCM.
REs are PCM controlled, to what extent I don't know.
Yes, there are a few differences in the year of the 44RE-46RE's (I think it was either 2000 or 2001+) with the electronics.
Why don't you do your homework first BEFORE posting up crap that you have no idea about? I'm gettin real tired of sorting through your false an misleading posts that include garbage information and having to prove you incorrect once again. Also, try using spell check once in a while cause your grammar sucks!
All your doing is clogging up the boards with stupidity once again!
#16
01-06-2011, 11:35 AM
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#17
01-06-2011, 12:48 PM
THE ULTI-MOD