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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.  

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4T40E / 4T45E
The transmissions above are 4 speed automatics that are computer controlled.  The most common problems are: Your check engine light comes on. The transmission starts shifting erratically or not at all.

Make sure you or a shop runs a scanner on the vehicle. You want to see if a sensor has gone bad causing your problem.

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TAAT
The transmissions above are 4 speed front wheel drive automatics that are all computer controlled. If your transmission starts shifting erratic, 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.

This transmission has a common problem with the valve body wearing out causing  many different reverse symptoms ( no reverse, harsh reverse or reverse slipping ). I recommend replacing the valve body from the dealer on every rebuild.

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