Originally Posted by solarboy
Does it have a filter?
Yes, gasket and filter will need to be changed:
You'll want some RTV as well:
And save yourself the headache and just get Motorcraft Fluid Mercon V:
Might be $1~3 more expensive than castrol but I'd trust this more than anything else. Comes in an orange bottle, sold at Oriley and Ford Dealer. USE ONLY MERCON V. DO NOT USE MERCON LV, IT IS NOT COMPATIBLE.