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There is a refill plug on the side of the transmission, and overfill plug. You will need to remove both plugs. Fill thru the fill hole until fluid runs out the overfill hole. Make sure it is on level ground.
Agreed however you need to be aware this transmission takes type "WS" fluid only available at the dealer, do NOT put fluid in from a parts store. Also the transmission must be at a certain temperature range before removing the overflow plug and then overfilled from this level by 1/2 quart.
" They should not be mixed. "WS FLUID IS A WORLD STANDARD(WS) FLUID THAT IS NOT INTERCHANGABLE WITH ANY OTHER FLUID AND AT THIS TIME THERE IS NO EQUIVALENT FLUID. DUE TO REDUCED VISCOSITY"