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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.

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ES250 1990-91 2.5L A54OE  
ES300 1992-93 3.0L A540E 1994-01 3.0L A541E
GS300 1993-95 3.0L A340E 1996-98 3.0L A350E
GS400 1998 4.0L A350E  
LS400 1990-97 4.0L A341E 1998 4.0L A350E
LX450 1996-97 4.2L A343F  
LX470 1998-01 4.7L A343F  
RX300 1998-00 4X4 3.0L A540H 1998-00 3.0L A247E
SC300 1992-00 3.0L A340E  
SC400 1992-97 4.0L A341E  

 

 

 

 

 

A540E / A541E / A540H / A247E
The transmissions above are front wheel drive 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 or output speed sensor 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. Check the shift solenoids that attach to the transmission casing, sometimes they can go bad.

Many of the transmissions above have
separate fill for the trans fluid and the differential, so be care full! I see a lot of differentials burn up from lack of lube. Then the transmissions need to be rebuilt. On most of these models, they have a diagnostic box you can retrieve codes with. The location of this box should be in your owners manual.

 

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A340E / A341E / A343E / A350E
The transmissions above are rear wheel drive 4 & 5 speed automatic transmissions. The A350E is the 5 speed. 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.

On most of these models, they have a diagnostic box you can retrieve codes with. The location of this box should be in your owners manual.

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A40 / A40D / A42DL / A43D / A43D / A43DL / A43DE / A44D / A44DL / A45DL / A45DF 
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. Common symptoms are transmission shifting erratic, slipping or not shifting at all. Also the check engine light can come on.
On most of these models,, 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.

 

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