A lot of people have said syncro's are the cause of the trans popping out of gear. The syncro's help the shift collar align with the gear so you can shift without grinding.
The detents in the shift rods along with the poppet balls and poppet springs keep the shift forks in the correct position. I would suggest that you pull the top cover and replace all the poppet balls and poppet springs, lube the rails and put a shift lever rebuild spring kit in it.
That should take a few hours and cost less than 20.00.
Dave's 78 Build
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.