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The Dana 50 and Dana 60 spindle socket has 6 prongs on it instead of the 4 prong like the Dana 44/35/30/GM 10 bolt uses. My 84 F250 RC LB has the Dana 50 front axle and Dana 70u rear axle. According to my VIN plate and LMC truck I have an F250 HD.
interesting.
i guess this tool's sticker about the start year "85" is correct.unlike your "84" these do require the 4 tab tool like the d44.however its bigger.