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.

  MAZDA  
FIND THE MAKE OF YOUR VEHICLE
CLICK ON THE YEAR OF YOUR VEHICLE

323 1986-88 1.6L F3A 1988-89 1.6L G4A-HL 1990-91 1.6L G4A-EL all wh dr 1990-94 1.6 / 1.8L F4A-EL
626/MX6 1983-86 2.0L F3A 1986-93 2.0 / 2.5L G4A-EL 1994-00 2.0L CD4E 1994-00 2.5L GF4A-EL
929 1988-91 3.0L N4A-EL 1992-95 3.0L RE4RO1A    
Miata 1991-97 1.8L L4N71B 1998-01 1.8L A44DE    
Millenia 1995-01 2.5L GF4A-EL 1995-01 2.3L JF403E    
MPV 1989-95 2.6L L4N71B 1989-99 3.0L RE4R01A    
MX3 1992-95 1.6 / 1.8L F4A-EL      
Navajo 1991-94 4.0L A4LD      
Pickup 1986-89 2.0 / 2.2 / 2.6L L4N71B 1986-89 2.0 / 2.2 / 2.6L 4X4 3N71B 1990-93 2.2 / 2.6L L4N71B 1990-93 4X4 2.6L RE4R01A
  1994 2.3 / 3.0 / 4.0L A4LD 1995-97 2.3 / 3.0L 4R44E 1997-00 4.0L 5R55E 1998-00 2.5 / 3.0L 4R44E / 4R55E
Protege 1990-94 1.6 / 1.8L F4A-EL 1995-98 1.5 / 1.8L F4A-EL    
RX7 1980-83 rotary 3N71B 1984-88 rotary L4N71B 1989-92 rotary N4A-EL 1993-96 rotary RE4R01A
 

 

 

 

 

A4LD
This transmission is a rear wheel drive 4 speed automatic. Common symptoms are erratic shifting, hesitating going into gear and losing transmission fluid without a trace of a leak. 

You have a modulator on the passenger's side of the vehicle pointing towards the driver's door.  Pull the rubber line off the modulator and see it trans fluid comes out of the line.  Now, if it does your modulator is no good.  It can cause any of the above symptoms. then make sure you or a shop run a scanner on the vehicle.

You also have band adjustments on this trans. Make sure they adjust them when your transmission is serviced.

 

Back To Home Page          Back To Top of Page

 

 

 

 

 

 

 

 

 

CD4E / G4A-EL / G4H-EL / G4A-EL / GF4A-EL / F4A-EL
The transmissions above are 4 speed front wheel drives. They are all computer controlled.  If your transmission starts shifting erratic or not at all, 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. The vehicle speed and range sensors like to go bad on vehicles with these transmissions in them. So keep that in mind.

 

 

 

Back To Home Page          Back To Top of Page

 

 

 

 

 

 

 

 

4R44E / 4R55E
The transmissions above are rear wheel drive 4 speed automatics, that are all computer controlled. Common symptoms are, overdrive light flashing, transmission shifting erratic, slipping or not shifting at all. 

External sensors on the vehicle like the  throttle position sensor or vehicle speed sensor quite often go bad, causing these symptoms.

Always run a scanner first to see if a sensor is causing your problem.

 

 

 

Back To Home Page          Back To Top of Page

 

 

 

 

 

 

 

 

5R55E
The transmission above is a rear wheel drive 5 speed automatic, that is all computer controlled. Common symptoms are, overdrive light flashing, transmission shifting erratic, slipping or not shifting at all. 

External sensors on the vehicle like the  throttle position sensor or vehicle speed sensor quite often go bad, causing these symptoms.

Always run a scanner first to see if a sensor is causing your problem.

 

 

 

Back To Home Page          Back To Top of Page

 

 

 

 

 

 

 

 

 

A44DE
The transmission above is a rear wheel drive 4 speed automatic 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. Common symptoms are transmission shifting erratic, slipping or not shifting at all. Also the check engine light can come on.
On most Toyotas, they have a diagnostic box you can retrieve codes with. The location of this box should be in your owners manual.

Make sure your clutch fan on the front of the motor is not starting to seize up.  This causes the engine to sound unusually loud almost like the transmission is not shifting into 4th gear.
 

Back To Home Page          Back To Top of Page

 

 

 

 

 

 

 

 

 

L4N71B
This transmission is a rear wheel drive 4 speed automatic. Common symptoms are erratic shifting, hesitating going into gear and losing transmission fluid without a trace of a leak. 

You have a modulator on the driver's side of the vehicle pointing towards the driver's door.  Pull the rubber line off the modulator and see it trans fluid comes out of the line. Now, if it does your modulator is no good.  It can cause any of the above symptoms. Some units also have a shift solenoid for 4th gear, Keep that in mind if 4th gear is your problem.

You also have band adjustments on this trans. Make sure they adjust them when your transmission is serviced.

 

Back To Home Page          Back To Top of Page

 

 

 

 

 

 

 

 

 

 

 

L3N71B
This transmission is a rear wheel drive 3 speed automatic. Common symptoms are erratic shifting, hesitating going into gear and losing transmission fluid without a trace of a leak. 

You have a modulator on the driver's side of the vehicle pointing towards the driver's door.  Pull the rubber line off the modulator and see it trans fluid comes out of the line.  Now, if it does your modulator is no good.  It can cause any of the above symptoms.

 

 

 

Back To Home Page          Back To Top of Page

 

 

 

 

 

 

 


RE4R01A / R4A-EL
The transmission above is a rear wheel drive, 4 speed automatic. Shift timing is computer and throttle pressure cable controlled. the throttle pressure connects from the transmission to the carburetor or throttle body, depending on the configuration of your engine. Also check this cable and run a scanner first to see if a sensor is causing your problem. Make sure the cable is not out of adjustment. 

External sensors on the vehicle like the  throttle position sensor or vehicle speed sensor quite often go bad, causing these symptoms.

 

 

Back To Home Page          Back To Top of Page

 

 

 

 

 

 

 

 

JR403E / JF403E
 The transmission above is a rear wheel drive 4 speed automatic transmission. It's 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.
Check the throttle pressure cable adjustment that goes from your transmission to your throttle pedal under the dash also.

 

Back To Home Page         Back To Top of Page

 

 

 

 

 

 

 

 

F3A
This transmission is a front wheel drive 3 speed automatic. Common symptoms are erratic shifting, hesitating going into gear and losing transmission fluid without a trace of a leak. You have a modulator on this style transmission. 

Pull the rubber line off the modulator and see it trans fluid comes out of the line.  Now, if it does your modulator is no good.  It can cause any of the above symptoms.

 

 

Back To Home Page                Back To Top of page

 

 

 

 

 

 

 

 

N4A-EL
 This transmission is a rear wheel drive 4 speed automatic. It is computer and vacuum controlled. Common symptoms are erratic shifting, hesitating going into gear and losing transmission fluid without a trace of a leak.

You have a modulator on the driver's side of the vehicle pointing towards the driver's door.  Pull the rubber line off the modulator and see it trans fluid comes out of the line. Now, if it does your modulator is no good. It can cause any of the above symptoms. Some units also have a electrical shift solenoid for 4th gear, Keep that in mind if 4th gear is your problem.

You also have band adjustments on this trans. Make sure they adjust them when your transmission is serviced.

Back To Home Page          Back To Top of Page