You can get a complete 8" center section with everything new (incl truetrac) but the case and the yoke for $1000. It's $800 for a new trac loc ltd slip (clutch type).

Seems like just buying a suregrip for you 8.25" axle would be by far easier and cheaper. You can likely buy with new bearings pressed on and install it yourself - no need to remove pinion and only need to set backlash+side bearing preload when you're done.

Lou