21 PB Automatic Transmission Fluid Change

[JerseyGlock]

Hello,
Can someone please tell me how many quarts of ATF do I need for drain and fill on a 21 PB. Is there a drain plug or I need to drop the pan? Refill the fluid via dipstick? Thanks.

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[Gros Ventre]

By owners manual 5 qts. Check the spec on the oil you buy. Ford ^ GM jointly developed the 10R80 transmission. GM specifies a higher viscosity than Ford. Some companies will say that their oil meets specs when the reality is they meet GM specs not Ford. Also, it is not simply a drop the pan, replace the filter & oil drill. There appears to be significant interference that must be removed to get the pan to allow the flter to drop. Finally, be careful on refill. If you overfill the engine/transmission knows it and won't run/move.