Heavy Duty RR Torsion Arm, Straight, 7/8" x 11-1/2", X6 & X7 rear end 04-617TI - Titanium 5/16" O

04-617TI - Titanium 5/16" O

Hyper Racing # 389-200

Hyper Racing # 389-321

Includes heavy duty (HD) rue clip and spacer

Some older Hyper Chassis were originally equipped with Wilwood master cylinders

Heavy Duty RR Torsion Arm, Straight, 7/8" x 11-1/2", X6 & X7 rear end 04-617TI - Titanium 5/16" OHyper Racing # 40 1725HD This is the heavy duty 3 4" thick version of the 40 1725 torsion arm. Redesigned in 2017. The X4, X6, & X7 Hyper rear torsion arms are now designed with two shock mounting holes. The idea for the new hole, which is closer to the shackle mounting hole, was conceived when the R&D was being performed for the X7 chassis. More shock control was needed to control the rear axle when in the forward position (short wheelbase). In lieu