The Strongest Savage Diff Compilation.

[simplechamp]

The Savage shafts should work fine, the cups are designed differently so no sliding blocks are needed. Here is the IRC Lightning Stadium cup with HotBodies hardened steel gears and regular steel shafts. You can see the slots that the cross-shafts fit into.

The Savage ring gear should be able to work OK with this diff setup. If the internals feel too loose you can add shims behind the gears. If the internals feel too tight try using 2 diff gaskets instead of 1 to space things out.

EDIT: I added another pic, this is what I call my "diff first-aid kit". Not a bad idea to put one of these together and throw it in your toolbox.