You are taking me back about thirty years to my first truck, but I did that swap too (but w/o OD). To make it work, I remember buying rods like the syncro trans came with and grafted the lower portion of those to the upper portion of the truck's orig rods. Actually, I personally could not make it work (young and stupid) so I took it to a trans shop and they did it. You are not going to like this, but it never worked that well. I mean, it shifted from gear to gear, but the linkage seemed to have too much flex and twist so it never felt solid.
Not sayin' a great fabricator couldn't do it right, but I was not happy with mine. I sold the truck before that issue got sorted out. I know, lotsa help I am.
