The crankshaft position sensor is located at the rear of the engine & the reluctor plate/wheel is located behind the flexplate / flywheel. Basically the transmission needs to be supported, unbolted & moved back from the rear of the engine sufficiently to allow removal of the flexplate & reluctor wheel. Obviously the transfer case, front & rear prop shafts, starter motor etc need to come out. Ebay parts listing info is here:
https://www.ebay.com.au/itm/32399322...3MD8EYRM040ZGZ