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.

 
FORD  VEHICLES 
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CLICK ON THE YEAR OF YOUR VEHICLE

Aerostar 1982-86 C5 1985-95 A4LD O/D 1996-97 O/D 4R44E/4R55E
Bronco  1978-91 C6 1985-93 AOD O/D !994-96 E4OD
Bronco II 1984-90 A4LD O/D    
Contour 1995-00  CD4E    
Cortina 1974-87 C4    
Crown Victoria 1983-92 AOD 1993-94 AODE 1995-08 4R70W / 4R75E
Escort 1981-90 ATX 1991-95 4EAT  
Excursion 2000-2006 4R100 or 5R110W O/D    
EXP 1982-88 ATX    
Expedition 1997-2003 5.4L E4OD - 4R100 1997-06 4.6L 4R70W/ 4R75E  
Explorer 1995-96 4R44E/4R55E 2002-2008 5R55W/S 4.0 or 4.6L ( No Fill Tube) 1996-05 5.0Lor 4.6L 4R70W
F-150 -F-450 1965-83 C4 3Spd 1968-96 C6 3Spd 1989-05 4SPD E4OD/4R100
  1993-2008 4R70WO/D  2003-2009 5R110W 5 SPD  
Fairlane 1964-70  C4 /C6    
Fairmont 1978-83 C4 / C5    
Falcon 1965-74 C4    
Focus 2000-2008 4F27E    
Freestar 2004-2007 4F50N    
LTD 1975-80 C4 1975-80 C6 1980-86 AOD
Mustang / II  1966-81 C4 1980-93 AOD O/D 1994-2005 4R70W  O/D
Pinto 1971-80 C3 / C4    
Probe  1989-96 G4A-EL 1995-97 CD4E  
Ranchero 1965-79 C-4 1977-79 C-6  
Ranger 1985-94 A4LD  1995-2008 4R44E 4R55E 1997-2006 5R55W/S  ( No Fill Tube)
Taurus 1986-90 4spd AXOD 1991-01 AXODE- AX4S 1995-2007  AX4N/4F50N
Tempo  1984-94 ATX    
Thunderbird 1968-86 C-4 -C-5 1968-79  C-6 1980-92 AOD
  1993-97AODE and 4R70W 2002-2006 5R55W/S  ( No Fill Tube  
Torino  1968-78 C-4 1968-78  C-6  
Van 1965-77 3 SPEED C-4 1975-93 3 SPEED  C-6 1983-90 AOD O/D
  1989-2008  E4OD or 4R100 O/D 20 Bolt Pan 4.6/5.4L 1995-2008 4R70W/4R75W O/D 4.6L / 5.4L  2004-2008 5R110W 5 SPD        6.0/6.8L F-350
 Windstar

1994-00 AX4S 17 Bolt Pan

2001-2004 AX4N 19 Bolt Pan  

 

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. If the vehicle speed sensor goes bad it can cause a no 4th gear symptom.

You also have band adjustments on this trans. Make sure they adjust them when your transmission is serviced. I recommend that you always replace the boost valve when rebuilding any Ford transmission.

 

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CD4E / G4AEL / 4EAT / AX4S /AX4S /AX4N
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 transmission range sensors like to go bad on vehicles with these transmissions in them. So keep that in mind.
I recommend that you always replace the boost valve when rebuilding any Ford transmission.

 

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E4OD / 4R70W / AODE
The transmissions above are rear wheel drive 4 speed automatics  that are all computer controlled.  Common symptoms are overdrive light flashing, trans shifting erratic, slipping or not shifting at all. external sensors on the vehicle like the manual lever position sensor or 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. I recommend that you change the transmission fluid about every 12,000 to 15,000 miles. These transmissions can develop a symptom called torque converter chatter. The vehicle feels like you are running over railroad tracks when the torque converter locks up between  35-50 miles per hour. There are also valve body recalibration kits you can have installed to help prevent this before it occurs, or while your transmission is being rebuilt. The manual lever position sensors like to go bad on vehicles with these transmissions.

I have seen a number of wire harness connectors that go bad and start seeping trans fluid up through the connector where the trans wire harness plugs into the transmission mostly on the 4R70W. Keep that in mind if you are having a problem. Upgraded Cast iron planetaries are now available for heavy trucks or motor homes with E40D style transmissions. I recommend that you always replace the boost valve when rebuilding any Ford transmission.


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C3 / C4 / C5  / C6
The transmissions above are rear wheel drive 3 speed automatics.  Common symptoms are:  erratic shifting, slipping or losing trans fluid without a source of a leak. 

You have a modulator on the rear of the transmission on the C4 / C5 and the C6 units.  The modulator is on the passenger's side of the transmission on the C3. Pull the vacuum line off  the mod. If fluid comes out of the vacuum line your modulator is not good.

Make sure your bands get adjusted when you service your trans.  Make sure they do not lose your little spring and plunger that is under your filter on C4, C5 and C6 styles.  This will cause unusually early and soft shifts.


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ATX
This transmission is a front wheel drive 3 speed automatic. Common symptoms are: Early soft, late hard shifts or no shifts at all.  Listen up because this problem happens all the time. 

Always check the throttle
pressure rod that goes from your transmission to your carburetor or throttle body linkage. This controls shift points and often the plastic little bushings that hold it on, get brittle from the heat, breaks into pieces and falls off causing symptoms above. Good Luck!
I recommend that you always replace the boost valve when rebuilding any Ford transmission.

 

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AOD
This transmission is a rear wheel drive 4 speed automatic and shift timing is controlled by a throttle pressure rod or cable that connects from the transmission to the carburetor or throttle body. Listen up again because this problem happens all the time.  Always check the throttle pressure rod that goes from your transmission to your carburetor or throttle body linkage.  

This controls shift points and often the plastic little bushings that hold it on, get brittle from the heat, breaks into pieces and falls off causing symptoms above. Good Luck!

I recommend that you always replace the boost valve when rebuilding any Ford transmission.

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AXOD
This transmission is a front wheel drive 4 speed automatic and shift timing is controlled by a throttle pressure cable that goes from the transmission to the carburetor or throttle body. 

Always check this item first. If you do have to have your transmission rebuilt, make sure whoever rebuilds it, makes a modification called full time lube. This modification gives your transmission better trans cooler flow. You want to have at least 1 quart in 20 seconds, when vehicle is hot, on your return line from your trans cooler (radiator), to your transmission.
I recommend that you always replace the boost valve when rebuilding any Ford transmission.

 

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4R44E / 4R55E
These transmission 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. If you screw the force motor in 1/2 turn the transmission has better shifts and engagements.
I recommend that you always replace the boost valve when rebuilding any Ford transmission.
Always run a scanner first to see if a sensor is causing your problem.

 

 

 

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5R55 N/S/W
These style transmissions do not have fill tubes to commonly check the trans fluid level. This transmission has a common problem of the case bores wearing out where the o/d - Intermediate servo pistons ride, causing various transmission slipping codes. There are also several different valve bodies and solenoid packs, Be careful.

 




 

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5R110W

These transmission are rear wheel drive 5 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. This transmission has many shift solenoids and pressure switches inside.
I recommend that you always replace the boost valve when rebuilding any Ford transmission that has one.
Always run a scanner first to see if a sensor is causing your problem.

 

 

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4F27E

These transmission are front wheel drive 4 speed automatics, that are all computer controlled. Common symptoms are overdrive light flashing, check engine light on, transmission shifting erratic, slipping or not shifting at all.  External sensors on the vehicle like the  throttle position sensor or vehicle speed sensor can go bad, causing these symptoms. This transmission has several solenoids that commonly go bad inside.
I recommend that you always replace the boost valve when rebuilding any Ford transmission that has one.
Always run a scanner first to see if a sensor is causing your problem.







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