Do some research. There are a few old threads about this. I think I read it on both, but found more info on FJ if I remember correctly.
And I have one sitting in my garage for the day that I finally open the valve cover.
FocusXtreme - Hatch Nation #96
04 ZX3 5.0, T5, 4 lug 7.5 w/ 3.73s [3/13 ROTM] ["Best Non-SVT" FITF '12]
12 SE Hatch Sport & Winter Package, ST Front End
91 Ranger XLT 3/4 drop
89 Bronco II XLT Well the body is still stock, what's left of it
97 Mountaineer 5.0, AWD, 3.73s