I CAN'T FIND ONE OF THOSE IF MY LIFE DEPENDED ON IT, at least one that's not junk.

Seriously, you're saying that the side gears (splined 'socket') is in two pieces? I'll admit I'm no Trac-loc experet technician, but it sounds like you've got side gear problems .

On the other side, you say the axle won't seat completely? Is it bottoming out on the pin? To check your spline engagement, grease the splines on the axle, stab them into place, and measure the grease 'smear'. You should have no more than 1 5/8" engagement before you start bottoming out... if so, you've got a mismatched set of axles to that housing. You'd better give me that differential after all {j/k}