2nd Gen Non-Engine/Transmission dana 60 gear ratio identifacation

[TFaucette]

I have a front axle from a second generation truck how can I determine wether its geared 3.54 or 4.10? I don't have truck or rear

 

[NIsaacs]

Pull the cover off, the ring gear will be stamped with the ring and pinion tooth count.

Nick

 

[Bob4x4]

rotate the input and count the output revolutions.

 

[TFaucette]

bob, for what ever reason in a open diff I have never been able to do that accurately( always seems like a 3.54 seems more like 2.5 when counting revolutions unless its posi). is it just me or does that only work for locked/limited slip diffs? and what tooth count is a 3.54 or 4.10?

 

[NIsaacs]

With an open diff. it's hard to make both sides turn the same. 4.10 is 10-41, 3.54 is 13-46.

Nick

 

[fest3er]

With one wheel stationary on an open diff, the other wheel should turn twice as fast. So 3½ turns of the yoke should result in nearly 2 turns of the wheel/axle for a 3.54, or under 1¾ turns of the wheel/axle for a 4.10. Or, differently, 1¾ turns of the yoke should result in nearly 1 turn of the wheel/axle for a 3.54, or just under ⅞ of a turn for a 4.10.

So raise one tire, engage the front axle disconnect (swap the vacuum lines and run the engine, or apply external vacuum), set the yoke horizontal, mark the bottom (south) of the sidewall, turn the yoke 3 half turns and another ¼ turn (1¾ turns total). If the mark ends up almost at the bottom (is pointing south), it's a 3.54. If it ends up turning less than ⅞ (is pointing SW or SE), it's a 4.10.