I recently stumbled upon this...
Anybody ever heard of, or used a Traction Concepts LSD conversion kit? MSRP for a 4t65e diff kit is $399. http://www.tractionconcepts.com/
Price seems steep for what it is. 2 pieces of milled tool steel and 4, maybe 8 springs. Unless there's some thrust washers in there that I'm not seeing. But still... I have to believe a guy with access to a mill could knock something like that out pretty cheap. Order up some 4140 from the local steel supplier, work it up, and get it heat treated. Throw them in a bag/box with some 5/8" red die springs. I'd pay a couple hundred for that. Not $400.
What am I missing?