old style locking hubs

[1976gmc20]

Originally Posted by 57taskforce

Fortunately your 2500 if a 6.0 has the same old tried and true 10.5 14 bolt (note, not duramax or dually, those are an 11.5” and not the same) that we all love and regard so much, just with fancy rear disks, Dana 70 spec axle tubes, metric lug studs and spacing, and a slightly wider wms. Internally the newer 10.5” 14 bolts are 95% identical. Unfortunately it’s got the same old gov-bomb G80 that they have had for a long time, which aren’t really known for being really stout. Don’t abuse it too bad and you’ll likely never have an issue. My 18 Sierra 2500 company truck weighs north of 12K and is ALWAYS in the sand or the mud depending on the time of year. 82,000 miles later with slightly oversize BFG and Toyo mud tires and it still works perfect. It’s when you go into it full throttle and one tire grabs unexpectedly, or you hammer it with one tire spinning hard that the governor blows up like longhair mentioned. They are quite handy when they work right.

Thanks! I don't think I ever full throttle anything.

[LONGHAIR]

Even back in the 80s-90s when those Gov-locs had such a bad rep, the bigger ones were better. I don't really know why? They still had the same stupid little spinning governor bits as the 1/2 ton units.
I've been out of the game so long, I haven't even seen inside of one of the newer ones.
The G-80 name is just an option code during manufacturing. It means different things for different years.

[1976gmc20]

Originally Posted by LONGHAIR

Even back in the 80s-90s when those Gov-locs had such a bad rep, the bigger ones were better. I don't really know why? They still had the same stupid little spinning governor bits as the 1/2 ton units.
I've been out of the game so long, I haven't even seen inside of one of the newer ones.
The G-80 name is just an option code during manufacturing. It means different things for different years.

The entire rear axle under my 2016 looks massive! I have more truck than I really need right now but I plan to keep it a long time and I know it can do just about anything I ever want it to do.

There is also the probability that folks who bought a 2500/3500 HD got them for work and didn't hot rod them like the half tons.