Bert Transmission Torque Arm One Piece CTDNYM-017-01 - The easiest way to set up your rear end pinion angle that you need. Bert’s adjustable torque arms replace anything available on the market by his unique design. The serration on both pieces prevents displacement of adjustment. Depending on track condition or frame height changed, the pinion angle could be changed at the race track in just a few minutes. By loosening four bolts you can increase or decrease the pinion angle of 5 degrees. Bert’s two piece torque arms also include adjustment holes for the front rubber bushing. Cars equipped with a sliders allow from 28” to 31-1/2” of length. (Only one does it all)