Originally Posted by NumberDummy

1957/83 F100 & 1975/86 F150

1957/60 used the small bearing. 1961/67 used the large bearing. 1968/72 could have either the large bearing or the one used w/the 9 3/8" rear axle.

1973 used the large bearing. 1974/79 used either the large bearing, or the axle bearing/seal combination. 1974/79: There's no way to know until you pull an axle.

1980/86 used the large bearing.

D8AZ-1225-C (replaced C9AZ-1225-A & C1SZ-1225-A) .. Large Axle Bearing.

Marked: F208-HL // C9AZ-1225-A marked 88128 or FPP or F208AKK // C1SZ-1225-A marked 88128.

E0TZ-1S177-CA (replaced C9AZ-1177-A & B7A-1177-A) .. Axle Seal-Use with large axle bearing.

Originally Posted by garbz2

Can be big bearing old or big bearing new.