Just picked up a new rear for my El Camino today. Its a 8.5 out of a 85 Olds 442. It has 3.73 gears with an open diff. I think I am going to go with a Detroit EZ locker. I got it with upper and lower control arms and factory sway bar for a steal.

http://i120.photobucket.com/albums/o194/robbob91/Image037.jpg

$250

STOP THIEF ! ! !---yes you did, good nab there even for an open rear---the posi from a camero or the like from back in the eighties will finish it off.....Dan