Hi James
If yur Ford F-150 4x4 has 10 cover bolts on the rear axle cover plate it is the 8.8” axle and the G/22-2013-456 gears and a G/235-2013A http://jo.my/kzw70v master kit will fit your axle . The front axle will use the G/22-2088-456 http://jo.my/4atpvm gears with a G/235-2088 http://jo.my/7i4n0g master kit. If the rear axle has 12 cover bolts then you have a 9.75” rear and it will use the G/22-2012-456 http://jo.my/rlvado gears and a G/235-2012A http://jo.my/ny4ips master kit. Thank You