USATransdoctor.com
These
recommendations do not
cover all possibilities.
They are some things to
check before you have
your transmission rebuilt. Always
check transmission fluid level first. Always run
a scanner on any computer controlled transmission. On
modulated transmissions make sure they have enough vacuum.
MITSUBISHI
FIND THE MAKE OF YOUR
VEHICLE
CLICK ON THE YEAR OF YOUR
VEHICLE
F4A / KM SERIES
TRANSMISSIONS
The
transmissions above are front wheel drive 3 & 4 speed automatic
transmissions. They are computer and throttle pressure controlled. Common
symptoms are transmission shifting erratic, slipping or not shifting at all. Also
the check engine light can come on.
External sensors like the throttle position sensor, vehicle speed sensor, output
speed sensor and inhibitor switch quite often go bad, causing these symptoms.
Check the throttle pressure cable that goes from your transmission to your
carburetor or throttle body depending on the configuration of your engine.
Always run a scanner first to see if a sensor is causing your problem.
Most of these style transmissions have sensors called pulse generators that plug
into the top of the transmission. Two things can happen, the sensors can go bad,
or a lot of people mix up the two sensor wire connectors by not marking them.
They plug them in wrong, because they look identical. These two things can cause
the transmission not to shift. Keep this in mind.
There are many variations to these transmissions. Many of the units above have
an transaxle identification number located on the fender shield in the engine
compartment. The transaxle case housing usually has a identification number
located on it also.
Back To Home Page Back To Top of Page
A500
The transmission above is rear wheel drive 4
speed automatic that
is computer and throttle pressure controlled. Common symptoms are
transmission shifting erratic, slipping or not shifting at all. External
sensors on the vehicle like the throttle position sensor , vehicle speed sensor
and even the neutral safety switch going bad can cause these problems.
Always run a scanner first and check your throttle pressure cable and adjustment
to see if they are causing the problems.
Back To Home Page Back To Top of Page
Torqueflite
904
The transmissions above are 3 speed automatics
and shift timing is controlled by a throttle pressure cable and or rod that
connects from the transmission to the carburetor or throttle body. Always
check this cable or rod first. They can cause erratic shifts and or no
shifting at all. Also check the clutch fan that is located at the front of
the engine. Sometimes they seize up, this causes the engine to sound
unusually loud almost like the transmission is not shifting into 3rd gear.
Keep in mind sometimes people work on the carburetor's of these vehicles and
they forget to either hook up the throttle pressure rod correctly or they forget
to reinstall the little return spring for the throttle pressure rod.
Back To Home Page Back To Top of Page
A44D
/ A44DL
The transmissions above are
rear wheel drive 4 speed automatics and shift timing is controlled by the
computer and a throttle pressure cable that connects from the transmission to
the carburetor or throttle body.
Always check these items first before
your purchase a transmission.
Always run a scanner first and check your throttle pressure cable and adjustment
to see if they are causing the problems.
Check the shift solenoid that attach to the transmission casing, sometimes they
can go bad, Causing no 4th gear.
Back To Home Page Back To Top of Page
A604
The transmission above is a 4 speed front wheel
drive automatic, that is all computer controlled. If your transmission
starts shifting erratic or stays in second gear only, then make sure you or a
shop run a scanner on the vehicle. You want to see if you have a sensor
that has gone bad causing your problems. Also make sure you check the
clutch volume index (c.v.i.). This helps determine the condition of the
transmission. Chevy's and Ford's do not have this neat little feature.
Vehicle's with A604 transmissions have chronic input and output speed sensor
problems and also with the little wire connectors to those input and output
speed sensors. The dealer offers a repair kit for these wires instead of
buying a whole new wire harness.
Back To Home Page Back To Top of Page
A340F
The transmission above is a rear wheel drive
4 speed automatic transmission. They are computer and throttle pressure
controlled. Common symptoms are transmission shifting erratic, slipping or
not shifting at all. Also the check engine light can come on.
External sensors like the throttle position sensor, vehicle speed sensor or
output speed sensor quite often go bad, causing these symptoms.
Always run a scanner first to see if a
sensor is causing your problem. Also check
the throttle pressure cable that goes from your transmission to your carburetor
or throttle body depending on the configuration of your engine.