Rear Gear Ratio

[DMcV]

I still can not figure out my Rear gear ratio.... I've looked here http://www.drivetrain.com/parts_catalog/ring_and_pinions/what_rear_end_ratio_do_i_have_in_my_ford__is_it_posi.html but I don't see anything that matches.... Can anyone help me ? Here is a photo of my Door Tag... Hope this helps, and thank you
Dennis

 

[milner351]

there should be a stamped tag on one of the rear axle differential cover bolts.
There will be numbers and letters stamped on it.

3L73 is limited slip 3.73
4L10 is limited slip 4.10

If there is just a space between the numbers - no L - it's an open diff.

 

[trackspeeder]

Dually ratio is 4.10