There's no question, the easiest way to identify the axle and gear ratio in your truck is from the door sticker. If you open the drivers door and look at the door jamb, you'll see a sticker like the one shown below:

You'll see that the area labeled (F) is for the Axle Code.

Here are some examples of actually stickers:

Once you know the door code, go to the chart below to identify it. If for some reason you find a code missing from the chart and would like to add it, please use the Contact Page.

You'll notice that there are some codes with different gear ratio's listed. Unfortunately, the same codes were reused in different years. If you have any more information to help narrow these codes down, please use the Contact Page.

Axle Code

(Door Sticker) Axle Capacity Gear Ratio Year / Vehicle 01 Ford 9″ 2800 2.75 02 Ford 9″ 2800 3.00 04 Ford 9″ 2800 3.25 07 Ford 9″ 2800 2.47 12 Ford 3800 2.73 1991 13 Ford 9″ 3750 2.75 1981-1983 13 Ford 8.8 4.11 1985-1986 14 Ford 9″ 3750 3.00 1981-1986 15 Ford 9″ 3750 3.25 1981-1982 15 Ford 3.31 15 Ford 9″ 3750 2.73 1983 16 Ford 9″ 3750 3.50 16 Ford 3.73 17 Ford 3300 3.25 1971 17 Ford 3800 3.31 1995 / 1999-2002 / Expedition 17 Ford 3.55 1998 17 Ford 3.73 1997 17 Ford 9″ 3750 2.47 18 Ford 8.8 3800 3.08 1983-1986 19 Ford 8.8 3800 3.55 1983-1986 / Expedition 22 Dana 5300 4.10 23 Dana 60 5300 3.54 24 Dana 60 5300 3.73 Econoline 25 Ford 5300 4.10 1991 25 Dana 60 5300 3.33 26 Ford 4050 3.55 26 3.73 F-250 27 3.31 F-250 27 Ford 5300 3.73 27 Dana 70 7400 4.10 28 Dana 70 7400 4.56 29 Ford 10.25″ 5300 3.55 1991 31 Dana 6250 3.07 31 3.73 F-250 / Excursion 32 Dana 6250 4.10 Econoline 32 Dana 61 5300 3.00 33 Dana 61 6250 3.54 33 Ford 4.30 F-250 34 3.73 Econoline 35 4.09 Econoline 35 Ford 6250 4.10 1991 36 Dana 70 7400 3.73 1980 36 4.56 F-250 37 Dana 60 5300 3.54 37 Non Limited Slip 3.73 Super Duty 3L Limited slip 3.73 Super Duty 38 Ford 6250 3.08 38 Dana 60 5300 3.73 39 Ford 10.25 6250 3.55 1991 Econoline 41 Dana 6250 3.54 41 3.73 F-350 41 Non Limited Slip 4.10 Super Duty 42 Dana 6250 3.73 42 Dana 7400 4.10 43 Dana 7400 3.54 43 Dana 6250 4.10 43 4.30 F-350 4L Limited Slip 4.30 Super Duty 4N Limited Slip 4.10 Super Duty 4W Limited Slip 4.10 Ambulance Package 44 Dana 6250 4.56 45 Ford 7400 4.10 1991 46 4.56 F-350 48 Non Limited Slip 4.88 Super Duty 49 Ford 10.25 7400 3.55 1991 51 Dana 70 HD 7400 3.73 52 Dana 70 HD 7400 4.10 Econoline 53 Dana 70 HD 7400 4.56 1982 53 Dana 70 HD 7400 3.54 1983-1986 53 Non Limited Slip 5.38 Super Duty 5L Limited Slip 5.38 Super Duty 56 4.10 Econoline 61 3.73 F-350 62 Dana 8100 4.10 63 Dana 8200 3.54 63 4.30 F-350 65 Ford 8250 4.10 1991 66 4.56 F-350 69 Ford 10.25 8250 3.25 69 Ford 8250 3.55 1991 72 Dana 6300 4.10 72 Dana 11000 4.63 73 Dana 6300 3.54 73 Dana 11000 5.13 73 4.30 F-450 75 5.38 F-450 78 4.88 F-450 81 3.73 81 4.63 Econoline 82 4.10 F-350 83 4.30 F-350 86 4.56 F-350 88 4.88 F-350 8L Limited Slip 4.88 Super Duty 95 5.38 F-550 98 4.88 F-550 B2 Dana 5300 4.10 B3 Dana 5300 3.54 B4 Dana 5300 3.73 B5 Dana 60 – Limited Slip 5300