What is the transmission fluid capacity in a 1998 Ford Taurus?

Answer 1

That could vary, depending on whether it has a AX4N or AX4S transmission.

AX4S - Synchronous Example 1: Cruising at 25mph (3rd gear), you floor it, it downshifts to 2nd gear briefly, then into 1st. Example 2: Full throttle acceleration from a stoplight to 35mph or so, then let off the gas. The transaxle will up-shift to 2nd gear very briefly, then finally into 3rd gear where it needs to be. In other words, it has to shift in order 1-2-3-4 and 4-3-2-1 AX4N - Non-Synchronous Example 1: Cruising at 25mph (3rd gear), you floor it, it skips second and downshifts directly to first. Example 2: Full throttle acceleration from a stoplight to 35mph or so, then let off the gas. The transaxle will upshift directly to 3rd gear, skipping second. In other words it can shift how ever it wants 1-3, 3-1, 2-4, 4-2, etc.. The AX4N is a more efficient transaxle. The ability to skip un-needed gears helps reduce wear and tear. Mechanically, the AX4S and AX4N are very similar, but hydraulically, they are not.

The AX4S capacity is 13.5 quarts, the AX4N capacity is 12.5 quarts.

http://www.taurusclub.com/forum/lofiversion/index.php/t57372.html has useful information if you're considering changing the fluid. Good luck!