Kenmore model 110.23012101

I have replaced both the motor coupler and the basket drive block and the thing goes out of balance no matter how big of a load you put in. It does not matter if it is on slow spin or fast. I am looked at the base and springs prety closely and did not notice anything cracked or broken. I am at a loss now as to what to do next. Could the basket springs be weak? Or what else is a wearing part that would cause this constant out of balance condition?