Heavy Duty RR Torsion Arm, Straight, 7/8" x 11-1/2", X6 & X7

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 of re-valving our shocks, we just added the new hole which adds 10% more effective shock rate to the dampening system thanks to the mechanical advantage change.

The new arm is also made a little stronger by increasing the relief pocket radius and increasing the web thickness in key areas.

The 40-401 Torsion Arm Standoff can also be used to allow the rear axle to drop further when the shock is fully extended. This is needed when using longer shackles or depending on shock brand as some