Join Date: Feb 2005
Location: Franklin, Maine
Drives: 2000 Mercury Sable LS 24V DOHC
Rep Power: 0
Again, I'm not an expert in this area and I've been away for the forums for a solid two years, but the basic difference between the AX4S and the AX4N is, if I recall correctly, the S means sequential and the N means non-sequential. The AX4S must shift in direct sequence (ie, 1-2-3-4) while the AX4N can skip gears (ie, 1-3, or 2-4).
I had an experience where hard shifts onset quite rapidly when my torque converter was failing, but that was, as I said, a rapid onset. Also, my issue was with the AX4N which is probably structured a little differently in that regard. If this is a longer-term problem, then the cause is probably something else. How many miles are on the car and is this the original transmission as far as you know?
ELYXR /// SHAY -
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2000 Mercury Sable LS 24V DOHC
2007 Mercury Milan AWD Premier 24V DOHC