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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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46RH / 46RE / 42RE /
The transmissions above are rear wheel drive 4 speed automatic transmissions, that are computer and throttle pressure controlled.  Common symptoms are transmission shifting erratic, slipping or not shifting at all. Always make sure your throttle pressure cable is hooked up and adjusted properly, and run a scanner to see if a sensor is causing your problem.

External sensors on the 46RH style, like the throttle position sensor, vehicle speed sensor or output speed sensor quite often go bad, causing these symptoms. 

On the 42RE / 46RE / 45REF styles, I have seen a lot of governor pressure solenoids and governor transducer sensors that attach to the valve body go bad. It's very difficult to tell if their is a problem with these two items when using a scanner, So be care full.

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A340F (30-40LE)
The transmission above is a rear wheel drive 4 speed automatic that is computer and throttle pressure controlled. Always make sure your throttle pressure cable is hooked up and adjusted properly, and run a scanner to see if a sensor is causing your problem. 

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

This is a very good transmission from the factory. If you install a trans cooler or keep your transmission fluid changed regularly, this transmission should get you some miles.

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45RFE

The transmissions above are 4 and 5 speed rear wheel drive automatics, that are 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 45RFE transmissions have chronic electrical problems so be careful.

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904 / 999

The transmissions above are rear wheel drive 3 speed automatic transmissions, that are throttle pressure controlled.  Common symptoms are transmission shifting erratic, slipping or not shifting at all. Always make sure your throttle pressure cable is hooked up and adjusted properly.

 

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