Although I am not familiar with the vehicle in question specifically, generally the line that goes to the top side of the radiator is the supply, and the line from the bottom of the radiator or trans cooler is the one returning the fluid to the trans.
touch it ,the cooler one is usually return
Return is the one that connects to the rear of the transmission.Return is the one that connects to the rear of the transmission.
Supply is above and return is under.
If this vehicle has a transmission cooler then it will have one line to the cooler then another for the return line to the transmission.
Remove the plug from the bottom of your 2000 Chevy transmission. Allow the transmission to completely drained out. Return the transmission plug to its original position. Fill the transmission with new fluid.
Bottom
Pressure and return lines that goto radiator and or transmission cooler to keep the ATF chilled off.
There are 2 lines. The return line is the line that is the the coolest after running the car. Usually the top line.
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The front fitting on the transmission is the hot pressured oil going to the oil cooler, the rear one is the return.
When your transmission goes bad, you have two options. First option is to give the transmission to your dealer and a get a refurbished (remanufactured) transmission in return. Second option is to get your transmission repaired (it would be taken apart and the defective parts repaired/replaced). This is called transmission re-build.
Turn 4WD off. Put transmission in reverse and back up a few feet. Return transmission to drive. If this does not work then something is not right and you should probably take it to a shop. Turn 4WD off. Put transmission in reverse and back up a few feet. Return transmission to drive. If this does not work then something is not right and you should probably take it to a shop.