89 530 is most likely a m30 motor 6 cylinder not a m60 v8 dave, it can be done in place by jacking the motor up about 4 inches and putting wood blocks under the motor mounts, before you jack it up ether disconnect the fan shroud and let it float or remove the fan then disconnect the air intake boot, jack it up slowly looking for anything else that may get hurt the hoses all have enough slack and should be fine, once you have the pan unbolted you need to unbolt the oil pump and drop it into the pan then you can slide the pan out, i think the nut holding the sprocket on the pump is reverse thread (been a while since i've done one) when you reinstall the oil pump sprocket use a good liquid thread locker on the nut (i had one come off once before i started using locktight)
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