I am trying to look thru my info,the first year for 3.42 was 71.I only thought cone type posi came on earlier axle's 65 era. The codes I've found are on the front of the right axle tube(passenger side). Does the axle have the bearing attached? or is the bearing inside the tube? Probably the first but 3.42? Unless that was another GM division gear. I have 'heard' there are HD axles.
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