1984 F150 axles
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1984 F150 should have 8.8". Be very careful purchasing anything seperately for the internal diff. carrier. In 1983 ?? Ford redesigned both L/S and open carrier and internal components.
Easy way to tell between early and late style 8.8: measure the diameter of the spider pin in the differential carrier. Early 8.8" had 3/4" dia. pin. Later 8.8" has 7/8" diameter spider pin.
Early vs late 8.8" diff's.--have different style of tooth cut (axle and spider gears) and internal carrier parts do not interchange at all.
If your diff. has a 7/8" spider pin, someone has updated it to a later model carrier.
If You don't want to remove cover, see if diff. has a rear cover with 10-bolts on it. You can call ford dealer with numbers on the tag. Tag may have number that starts with "S" or "V". Dealer can tell you from this number, what ratio and axle spline data that axle was built with. This will not confirm; however, that someone may have changed ratio or updated carrier to L/S or new style carrier. Good luck, Gearman
Easy way to tell between early and late style 8.8: measure the diameter of the spider pin in the differential carrier. Early 8.8" had 3/4" dia. pin. Later 8.8" has 7/8" diameter spider pin.
Early vs late 8.8" diff's.--have different style of tooth cut (axle and spider gears) and internal carrier parts do not interchange at all.
If your diff. has a 7/8" spider pin, someone has updated it to a later model carrier.
If You don't want to remove cover, see if diff. has a rear cover with 10-bolts on it. You can call ford dealer with numbers on the tag. Tag may have number that starts with "S" or "V". Dealer can tell you from this number, what ratio and axle spline data that axle was built with. This will not confirm; however, that someone may have changed ratio or updated carrier to L/S or new style carrier. Good luck, Gearman