Magnesium casting. Fits the smaller 4.250" diameter drive line balls (#919-8117), no plastic lining to wear. 2.4 lbs.
Longer design will not allow drive line to move back. Larger O.D. ball allows more clearance for u-joint. Fits over 3" torque tube. New lightweight design. Will only fit new MPD Super Ball, 4.45 diameter. Weighs just 2.15 lbs.
3" O.D. and 2-1/2" I.D. Teflon coated aluminum. End bored to fit 2.62 ball housing. Includes torque collar, tube and drive line ball. Fits 4.250 Firewall housing.
Not much to say here. More power, tacky track, failed u-joint... ouch! This steel torque ball housing will save you some pain. 3.46 lbs.
For Sprint Car Drive Lines Only. Will not fit Midgets