Bars are formed from 1-1/2" dia. steel tubing. Bars mount to the pinion rather than the axel tube, yet maintain adequate driveshaft clearance. J-bars, which feature 3/4" rod ends, allow up to 2" of adjustment. The 18-1/2" J-bar (ALL56155) has an adjustment range of 17-3/4" to 19-3/4", while the 20-1/2" bar (ALL56156) may be adjusted from 19-3/4" to 21-3/4" in length.