14 bolt rear differential
 

Just doing a fluid and gasket change on my 91 K5. All cleaned up and ready to re-assemble. The parts guy at the store didn't believe me when I mentioned I had a cast looking cover. He asked if he could check to make sure. He was a little jealous after that when he saw the 14 bolt cast HD cover.
https://cimg5.ibsrv.net/gimg/blazerf...8141bf6e97.jpg
https://cimg7.ibsrv.net/gimg/blazerf...a6e4a1e7df.jpg

Nice!!!

I'm jealous. I only have 13 bolts. :p
https://cimg7.ibsrv.net/gimg/blazerf...3b37bb24bf.jpg
Seriously, though, that's pretty cool. Somebody obviously upgraded it at some point, probably when the stock 10-bolt exploded.

🤣😂
Yea its likely. But one of the selling points was the upgrades it already has installed. Thats a nice cover! Looks like they got rid of the bottom bolt of a 14 bolt.

Those are the best kind of upgrades, the ones that somebody already did for you. :icon_banana:

That's a Crane cover that's made for a shaved housing. By cutting off the bottom lip from the housing, I gained a little over an inch of clearance. There are also shave kits available that take off even more, but they require you to weld a plate on the bottom and machine down the OD of the ring gear. I didn't really think it was worth the trouble and the potential problems for a relatively small amount of additional clearance.