Kenmore Series 90 Washer - won't spin but does agitate?

I have a Kenmore Series 90 Washer (Model 110.26902691). It agitates slower than normal and doesn't spin, though it does pump and drain water. We followed tips to checkout the coupler and found it still whole with no damage. What else might be wrong with it? I've had it for 11 yrs with no problems and it was running perfectly up until a few days ago. Is this worth a fix or is it time to replace?

Thanks in advance for all and any advice!