
Pulled the shafts to replace the bearings & seals and looked inside and there's a half a small pin with a button on the end shining back at me and daylight coming the a hole in the center of the diff.......check the other side for something similar inside the axle tube but no I've had to remove the diff now to fish out the other half, pushed out the old broken roll pin and put it back together now but even my chiltons didn't say anything about it or show it in a diagram.
Learning all the time!

All's well that ends well
