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have you scanned codes?
if the light is flashing there is a code...what scan tool?
you may need a professional grade scan tool not a autozone basic tool
The first thing to do is get the computer checked for trouble codes to keep from replacing good parts. The trans range sensor on the drivers side of trans were linkage attach's is a possible problem
the prnd switch where the shift cable attaches
correct 5r100 is on the valve body by the shift pawl
yes the 5r110w is internal on the valve body