Thanks again guys. The new diff I got is an AP2, and also got an AP1 flange to replace the AP2 flange on it, but I've learnt that simply swapping the flanges might not be so straightforward as it could mess up tolerances in the diff. So another risk here in swapping the diffs.

I think I'll first try a suggestion I got which is to add fresh fluid in the original diff and run it for about 20 minutes in 4th on the stands and see if it sounds okay and not get too hot. If okay, I'll probably take my chances with it at Laguna, then deal with swapping and rebuilding after Laguna when I have more time.

 

rlaifatt

I could use the AP2 flange if you want to part with it.
PM me if you do.

 

When I did my diff years ago, I found a set of hex keys mounted in 3/8" drive sockets. They were sold as GM brake hex wrenches (set of 3). One of them was the perfect fit for those bolts. A bit of Liquid Wrench and a sharp pull started them coming loose.

 

This may be a bit late, but wobble socket extensions helped me break the bolts loose.

 

After the hex is rounded out, cutting them is the only option.

 

I used an easy-out in the past with success.

 

Another viable alvernative, but the bolt is definitely trashed.

 

What? You mean you can't build it back up with Bondo?

 

I suggest Hot glue. It's better than duct tape

 

JB Weld