Are you referring to a specific model? Or are you saying the govloc came out in 1999? My 83 k20 has a semi float 14 bolt and govloc differential. The 88 suburban I had for a very short time also had the gov loc differential. In fact it had a new rear end because the original gov bomb exploded on my neighbor when he had one wheel on dry pavement and the other on ice .... Which is usually how they blow up. Terrible idea, the gov loc, it is. "hey guys! Lets let the one wheel get up some good wheel speed, then we will let lock up like BAM! Nothing bad can come from that, right?" The clutches are there to keep it from blowing itself up or breaking an axle when it locks up. To me a little friction modifier to help those clutches slip a little bit can only be a good thing. That is, if you can even get the darn thing to lock up when you actually need it. Seems like I spend half of my time plowing whishing the silly thing would work. Seems like if I can get it to lock up once, it will work half way decent the rest of the day, but getting it to lock up that first time can be a real chore.
Originally Posted By: FastLane
There was no locker back in 1991. It still had the G80 limited slip. The eaton G80 locker came in 1999.