You would have an A340F transmission in your 2000 4x4 4Runner. To confirm this and satisfy yourself that it is correct, take a look at the sticker on the inside of the driver's door. Near the lower right hand side of the sticker, it will say: A/TM ####/A340F (the four number signs will be a combination of 4 characters [letters and numbers] defining your axle code). The A340F is your transmission code.