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.

Contributed by TCCA member 95SE
Visual Differences