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Ford Dana 44 TTB

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Dana 44 TTB:

The Dana 44 TTB (Twin Traction Beam) was used in the front of Ford F-150ís from 1980 to 1996 and the full size Ford Bronco from 1980 to 1997. Production on the Ford Bronco completely ceased in 1997, but the Ford F-150 switched from the Dana 44 TTB to an 8.8 IFS front axle in 1997.

The Dana 44 TTB was a variation of the reverse cut solid axle Dana 44 used by Ford. It appeared in the F-150ís and Broncoís with coil springs.

Dana 44HD TTB (Medium Duty):

The medium version was the Dana 44HD TTB used on light duty (under 8500# GVW) Ford F-250ís from 1980-1986. This system uses leaf springs for both suspension and locating the axle housings (there are no radius arms with the leaf springs). The Dana 44HD TTB uses the same Dana 44 model TTB differential housing as the Dana 44 TTB.

The axle housings (beams) for the Dana 44HD TTB are made of .250 wall steel and they are shorter and heavier than the regular Dana 44 TTB. Because of the difference in length between the Dana 44 TTB and Dana 44HD TTB, the pivot brackets are designed differently, and attach to the front crossmember in different locations.

The Dana 44HD system uses larger steering knuckles, spindles, bearings, and hubs (8-lug) than the light duty version, and they cannot be interchanged. The only component interchangeable between the Dana 44 and Dana 44HD is the 3rd members (differential housing) and the locking hub mechanisms.

In 1987, the F-250 Dana 44HD TTB was replaced with a Dana 50 TTB.

Above is a comparison between the Dana 44HD TTB / Dana 50 TTB axle beam (top) and the normal Dana 44 TTB axle beam (bottom).

For more information on the Dana 50 TTB, click HERE.

Dana 44 TTB Third Member Housings:

Hereís a setup you donít see that often. It seems that the 1980-1983 Dana 44 TTB and Dana 50 TTB trucks that were equipped with a front limited slip differential also came with a unique housing that held the passenger side axle shaft in externally with (3) bolts. In the photo below, you can see the typical housing on the left that the passenger side axle shaft slides in to, and then the shaft is retained internally with a c-clip. Youíll notice that the housing on the right has a much larger opening to allow for a bearing, and the whole assembly is retained by (3) bolts.

The photo below shows the difference between the passenger side axle shaft that is held in with a c-clip, and the one that is bolted in..

Specifications

Ring Gear Diameter 8.5-inches
Carrier Breaks 3.73 Higher / 3.92 Lower
Ring Gear Bolts 10x3/8 inch
Pinion Shaft Diameter / Splines 1.376 inch / 26
Inner Axle Shaft Diameter / Splines 1.31 inch / 30
Outer Axle Shaft Diameter / Splines 1.21 inch / 19
Inner Axle Shaft Minimum Diameter 1.10 inch (necked)
Outer Axle Shaft Minimum Diameter 1.10 inch
U-Joints 5-297x
Maximum Tire Diameter 35-inches
Pinion Bearing Preload 14-19 in lbs (new) 6-9 in lbs (used)
backlash .006-.010 inches
Ring Gear Torque 55 lbs-ft
Carrier Bearing Cap Torque 60 lbs-ft
Pinion Nut Torque 200-220 lbs-ft

 

Dana 44 TTB (click to enlarge)

Dana 44HD / Dana 50 TTB (click to enlarge)

 

The Dana 44 TTB was never offered in the Ford Ranger but some enthusiasts have adapted into the Ranger.

The above two photos are equipped with Dana 44 TTB's using components from Autofab.  Note that the yellow Ranger above is using wider fiberglass fenders.  Unless you want a wider stance, we don't think your going to gain much more than if you just did the Dana 44 Knuckle Swap HERE.  The main key thing here is the axle benefits of the 35/44 hybrid. You'll have 1/2 ton outers meaning you have better hubs, wheel bearing spacing and larger rotors and calipers than on the Dana 35. 

Shaft wise, the Dana 44 stub shafts are larger than the stub shafts on a Dana 35. It's interesting to note, that the Dana 44 shafts have a neck-down on them that tapers down to 1.09" inches. The smallest point on the Dana 35 shafts is 1.16" inches where it tapers down to go in to the carrier. The only shaft on a Dana 35 that is smaller than the neck-down on the Dana 44, is the Dana 35 stub shaft, which is 1.0625" inches. Therefore, swapping the Dana 44 stub shaft on to a Dana 35 will actually result in a axle assembly with larger axles than the Dana 44.

If you do want to use a Dana 44 TTB and want beefier beams, Camburg offers offer pieces as well.

 

Another TRS user using a TTB Dana 44 front axle can be found HERE.

Other Resources:

Dana 44 TTB Manual

Axle Discussion Forum

 

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