so i picked up a different 14 bolt, this time from a 4x4. i scored big time with this one. it has 4.10s and some form of lsd or something like that. anybody know what it is?

 

Gov-Loc. AKA G-80. AKA timebomb. They often end up looking like this.

 

Looking closer at your pics, specifically the 2nd one, the side & spider gears look a little galled. I'd consider building the axle before installing it.

 

hmm, thats not cool. are the 14 bolts that bad also?

 

also not cool

 

In my opinion, it depends on the driver and what you're doing with the truck. But if your side & spider gears are galling, it's already junk.

 

what makes them do that?

 

One wheel peel, abuse basically. I'd bet the clutches are also worn out.

If you wanna re-use the gear set, Check the pattern and measure the backlash before teardown. Then set it up exactly the same when you go back together.

 

so if i want to keep this, what should i replace?

 

You can't rebuild those.