As I tried to put the front torque tube together, I got a hold of some aftermarket u-joints to replace the originals, GM 605118... My question is, the originals yokes are locked with a bolt to the the transmission shaft and the front shaft... As I assemble everything, I could actually use one of the aftermarket u-joints in the center to assemble the shaft and tube, BUT without the locking bolt to the shaft as it is set up with the original u-joints... Is this extra lock (bolt) really necessary?
