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Traction Bar Trailing Arm & Anti-Squat Bracket Fabrication Blueprints (Figs 6-1–6-4)
Drag-racing traction bar / trailing arm and anti-squat bracket fabrication drawings: dimensioned tube sizes, bushing/bearing details and materials list (4130N and mild steel).
This is page 119 of a suspension fabrication reference (blueprint-style), presenting four dimensioned fabrication drawings: Figures 6-1 through 6-4. Figures 6-1, 6-2 and 6-3 detail a homebuilt Traction Bar / Trailing Arm (Fig. 6-1 marked 'Drag Racing Only'), including the main bar made from 2" x 3" rectangular tubing, end plates, swaybar attachment, rear bushing race and bushings (4130N steel), front bearing housing (Schedule 160 pipe), bearing retainer, bearing spacer (1018 cold-roll steel), spring guide, spring pads/braces, and mounting brackets. It specifies Aurora HAB-12T spherical bearings and gives full material lists with pipe schedules, plate thicknesses, and Grade 8 hardware. A welding note instructs arc/MIG-welding the spring pads and guide 5.25" from the rear bushing centerline at a 5° angle. Figure 6-4 is a 'Dual Purpose' Anti-Squat Bracket with dimensioned outside, rear, and inside plates, torque braces, inside spacer plates, and shock mounts, plus an assembly note (approx. 78° angle; bolt to axle, align, and weld) and a materials list including 12mm Grade 10.9 and 1/2" NF Grade 8 hardware. A fabricator can use this page to cut, drill, and weld all components with exact dimensions provided.
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Frequently asked questions
- What bearing is specified for the traction bar trailing arm?
- The Aurora HAB-12T spherical bearing (2 required), retained by a welded-in bearing retainer made from 1/4" (1.660" O.D.) Schedule 80 steel pipe.
- What material is the traction bar main bar made from?
- 2" x 3" rectangular tubing with .1875" wall, mild steel, 42" long — two required.
- Where are the spring pads and spring guide welded on the traction bar?
- Arc/MIG-weld the spring pads and spring guide centered on top of the main bar, 5.25" from the centerline of the rear bushing, at an angle of 5°.
- How is the anti-squat bracket assembled?
- Per the assembly note, the angle is approximately 78° but should be fit to your axle assembly; bolt the pieces to the axle, align, and weld together.
- What hardware does the anti-squat bracket require?
- (2) 12mm x 120mm and (4) 12mm x 25mm bolts, nuts and lockwashers Grade 10.9, plus (2) 1/2" x 1" NF bolts, nuts and lockwashers Grade 8, and a 16" x 14" x .1875" mild steel plate.
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