I have a true SYE for a 231 T-case. It was bought with my lift kit, but I have a 242 case. Box was only opened to inspect parts and for pics. Never installed. I paid roughly $250 for it, and will sell it for $200. Includes instructions for anyone who wants to get brave and do it themselves...
Includes:
-Rear housing assy. (Housing, rear output seal, rear output bearing, output snap ring, all pre assembled)
-Rear output yoke
-Mainshaft
-speedometer snap ring
-mode gear snap ring
-speedometer drive gear
-housing plug
-rear output spline seal
-front output spline seal
-rear output yoke nut
-Instructions