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Inside the 2 1/2-ton Rockwell Axle

154 0305 Ton 2 Z

154 0305 Ton 3 Z
If it's still there, the easiest way to identify which style front axle you've found is by the tag (arrow). If the tag says Timken, then it's an older undesirable model with either the Bendix- or Rezepa-type shaft. If the tag says Rockwell, then it's got Spicer-type shafts.
154 0305 Ton 4 Z
If the tag is gone (and chances are it will be), then just cut the knuckle boot and peek inside to see if it has Spicer-style shafts. Boyce Equipment carries new boots for $28 each, and almost all of the old ones are hashed anyway.
154 0305 Ton 5 Z
If you're not looking for a rebuilt axle, then just grab the driveshaft flange and check it for slop. Most experts tell us that the bearings on the upper pinion shaft are the most common wear item. The rest of the axle is pretty much bombproof.

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