Xj not shifting in 4low

Xjproject417

New member
I have a 98 xj that doesn't like to shift when in 4low if I let up off the throttle all the way it will shift really harsh and then would sometimes immediately downshift. I have 2 speed sensor codes not sure if that's the reason for this problem anyone know. If you know how to check the sensors as well or know where I can find out how to test them that would be helpful too
 
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