What spline axle does a 1984 f150 have?

A 1984 Ford F-150 could have several different spline axle configurations depending on the axle type and options. There's no single answer. To determine the spline count, you need to:

* Identify the axle: Is it a Dana 44, Dana 60, or a different axle? This is usually stamped on the differential housing.

* Check the axle shafts: The easiest way is to remove a driveshaft and count the splines directly on the axle shaft.

Without knowing the specific axle type, it's impossible to give you a definitive answer. A parts store or a Ford mechanic would be able to assist if you have the VIN number, as it will specify the axle configuration.