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Primary rig is Green Thunder:
95' F-150 XLT 4x4, 302, 5 spd, MSD 6A, Flowmaster Exhaust, Sunroof, Clear corners w/ Diamond headlights, CD player with 2 10" subs and some 32" BFG Muds .
On my '97 it was recommended every 30K miles. You have to siphon out old fluid, make sure to use correct fluid as posted in owners manual, probably Mercon ATF.
My 90' has the drain plugs. One to drain, one to fill. They are both on the rearward side of the case. And Blownbronco, I would change it. I think it takes 4 quarts. Mercon ATF.