Drive train tech


    Ok, so pretend for a minute that your a chief designer for Ford's truck division.  You now have a very powerfull engine bolted to a stout transmission, now what do you do??  The answer is simple, drop it into a rugged chassis to match.

Rear suspension
    Ford uses a Sterling 10.25" rear axle fitted with either 4.10 gears in truck equipped with a manual transmission and 3.55's in trucks equipped with an automatic transmission.  The 94.5-97 were fitted with drum brakes while the 99 and up super duties were fitted with disk brakes.  All trucks used a taper leaf spring rear suspension.

Front suspension
2wd
    The independent front suspension used on all 2wd F-series trucks from 1980-1997 is know as Twin I-beam (aka TIB).  All 2wd used coil springs.  Although this setup is largely criticized for tire wear problems due to miss alignment or worn components, when properly aligned and in good condition, it provides an exceptional ride and handling.  The TIB setup is a very unique in how it operates.  To look at it from the front of the truck it looks like a flat "X" with the lower legs attached to the wheel end and the upper legs attached to the frame.  The left side I beam pivots on a mount on the right side of the frame and vice versa for the right side.  To locate the axle front to back Radius arms are bolted to the axle beam and run towards the rear of the truck to a pivot bracket just under the cab area.

4wd
    Ford used 2 different front suspension setups on it's F-series trucks.  The F-350's used a Dana 60 solid axle that was leaf sprung  The F250's used a Twin Traction Beam (TTB) setup.  This setup is similar in setup to the TIB used in the 2wd trucks, however, the drivers side beam housed a differential with an axle shaft running external through the passenger side beam to power the passenger side wheel.  The axle is known as a Dana 50 TTB however it is more of a hybrid axle design in that the center carrier is identical to the Dana 44 and the spindles are the same dimension as a Dana 60 so wheel hubs are interchangeable.  The axle shaft are larger in diameter and use a larger u-joint than those used in the Dana 44 however the ends of the shafts are "shanked down" to fit the Dana 44 carrier.

Here is an illustration of the TTB setup, the red arrows indicate
the pivot point of the axles


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