I have seen them mentioned but don't know for sure exactly what they are. I'm thinking a gov lock is like a selectable rear locker that came as a factory option. I have also read that while the 10b govlocks are bombs the 14b ones are pretty sturdy. If the 14B govlocks are strong why go to an unselectable locker in the rear? I have a source where I can get a pair of 4.10 3/4 ton axles with a 14b gov lock in the rear for around $500 (bolt in no work on axles needed). My blazer will be a multipurpose rig used as a dd, tow rig (26' camper), and snowplow truck as well as offroading. The govlock seemed like an ideal setup but being so much cheaper than aftermarket lockers there has to be a downside. Educate me.