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What gears do I have?
There are several methods for figuring out what gears you have. First there should be a tag on your diff cover. You can see the tag below is stamped 3.07.
 

 
is stamped 3.07. Next Dana axles have a bill of material code, which identifies everything in the axle this is stamped into the axle tube itself, and can be hard to spot as its very light. The picture below shows a bill of material stamping. Once you have this number, you can decode it on the Dana website
 

 
You can roughly estimate the gear ratio, by jack the rear axle up off the ground and spinning a tire, if the pinion makes 3.5 turns for one turn of the wheel you can figure you have 3.55 ratio.
 
Related Topics: | What gear ratio do I need? | Why do I need to regear? | What do I need to regear? | Can I install new gears? | Carrier Breaks: |
 
Related Writeups: | Differential / Gear Setup Basics | Axle Identification |
 
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