Thanks again Dan for your help.
Here are three pictures of the synchro body and 3rd and 4th gears.
The first pic identifies the gears and orientation of the synchro body tooling grooves, in this case it faces 4th gear.
The next picture shows 4th gear engaged. Notice the synchro body is just covering the dog teeth on 4th gear. There is some sort of mechanical limitation that will not permit the synchro body ring to progress past this popint on forth gear.
The third pic shows 3rd gear engaged. The synchro body is completely engaged and fully covering the dog teath of third gear.
In the next post I will turn the synchro body ring 180 degrees and post the results. Can you offer any comments concerning the difference in synchro body overlap of third gear dog teeth versus just covering 4th gears dog teeth. Download Attachment: 3rd engaged.JPG
32.13 KBDownload Attachment: 4th engaged.JPG
29.32 KBDownload Attachment: neutral groove 4th.JPG
1970 280SL 4-speed