Here are the pics of new third member I built for the rearend. Had to get rid of the open highway gears. The new setup is 3.55:1 with a clutch type mopar suregrip (Dana Power-Lock). These types of suregrip (posi) are rebuildable.
The junkyard truck rear the third member came from(free!!!):
Cleaning the third member housing before blasting:
Here are all the parts cleaned and ready to re-install. New yoke was a must. The suregrip is brand new bought !!
Pic of the third-member all setup and ready to install: