Dana 28 TTB / Dana 35 TTB Specifications

Ford Bronco II’s came with a reverse cut Dana 28 TTB (Twin Traction Beam) 4WD front axle from 1984-1989. Bronco II’s built after 11/1989 came with the larger Dana 35 TTB. Unfortunately, most Bronco II’s you find will have a Dana 28 unless someone has swapped in the Dana 35.

Your front axle may have a code stamped on the left carrier arm between the fill plug and axle end.  It will look like ‘F17A’ or similar.

What this code represents is;

• E = 1980’s
• F = 1990’s
• 1 = Last digit of year
• 7 = Ranger
• A = Light Truck Engineering

Since the Dana 28’s were built in the 1980’s, their code will start with an ‘E’ where as the Dana 35’s were built in the 1990’s and will start with an ‘F’.  The above mentioned code would indicate that the axle was a Ranger axle built in 1991.

There is a manufacturers label on the back side of the right axle beam that lists the year manufactured and gear ratio.

If you look at the top left of this sticker, you can see the Build of Materials number 610366 which identifies this as a:

610366 FORD 35 FRONT 1990 1/2-92 1/2 EXPLORER

The second box from top right identifies it as having 3.73 gears.

These stickers are on the back side of the passenger side axle beam. A chart of these numbers can be found below.

Axle Shaft Comparison:

Here is a picture of a Dana 28 & Dana 35 driver side axle shaft with the dimensions shown.

Spindle Comparisons:

Here’s a picture of a Dana 35 (Left) and Dana 28 (Right) spindle with dimensions shown.

Dana 35 Hybrid / Dana 35 Identification & Comparison:

The Whole Front Assembly:

(Dana 28 front axle beams, radius arms, and crossmember)