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Anti-Wrap Traction Bar Design Diagram - 14-Bolt Axle Johnny Joint Slip Spline

Labeled diagram of a fabricated traction bar with 14b yoke, plate gussets, and S-flex joint
Labeled diagram of a fabricated traction bar with 14b yoke, plate gussets, and S-flex jointOriginal file
Labeled diagram of a fabricated traction bar with 14b yoke, plate gussets, and S-flex joint

Reference · 1987-1991 BroncoAll 112 schematics

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Labeled fabrication diagram of a traction-bar setup showing the 14b yoke, plate gussets, S-flex joint, and driveshaft slip splines.

Part of 1987-1991 Ford Bronco Schematics

AI caption · Photo 1388 of 1850

This document is a home-made schematic (uploaded as "wrap_bar_idea.JPG") illustrating a design concept for an anti-wrap (traction) bar for a solid rear axle. Two views are shown. The upper-left drawing is a "Front View" of a "14b yoke" (14-bolt axle) mounting bracket, calling out 3/8" plate gussets and 1/2" plate tabs with a back plate, secured with two bolts. The lower drawing shows the full side-view layout of the wrap bar assembly: at the frame end, the bar attaches to a "box tube xmember" (crossmember) through an "S-flex or Johnny joint" pivot, followed by a section of "Driveshaft slip splines" that allow the bar to change length as the suspension cycles. The triangulated bar then runs rearward to the axle housing (drawn in blue), where it mounts through two "Rubber bushings" (drawn in red) on the axle bracket. A reader can learn the intended component arrangement and material thicknesses (3/8" gussets, 1/2" tabs/back plate) for fabricating this style of anti-wrap bar, including which joints provide articulation (Johnny joint/S-flex and rubber bushings) and how length change is accommodated (slip splines). No part numbers, dimensions of bar length, torque values, or vehicle years are stated.

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Frequently asked questions

What thickness plate is used for the gussets and tabs in this wrap bar design?
The diagram calls out 3/8" plate gussets and 1/2" plate tabs with a back plate at the 14b yoke bracket.
How does the wrap bar attach at the frame/crossmember end?
It attaches to a box tube crossmember ("box tube xmember") using an S-flex or Johnny joint.
How does this wrap bar accommodate suspension movement and length change?
The design uses driveshaft slip splines near the crossmember joint to allow the bar to change length, plus an S-flex or Johnny joint at the frame end and rubber bushings at the axle end.
How does the bar mount to the axle?
The axle end mounts through two rubber bushings on a bracket at the axle housing, shown with a front view of the 14b yoke bracket using 3/8" gussets and 1/2" tabs and back plate.

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