May have outsmarted myself here. Just finished a resto on another 74 DT360A. Sold it on ebay last week ($3200) Had it running like new but noticed a slight leak around the shift shaft and decided to replace the seal. After replacing the seal, I had trouble getting the circlip in the slot - no clearance - had to pull on the shaft to expose the slot? When re-installing the shift lever, I had to tap on it to get it on the shaft. When i started it for a test ride, the shifter would not engage. I pulled the shaft out about 1/2" and was able to shift into first, but it won't upshift into any other gear. It was getting dark, so I rolled it in for the night.

Any thoughts? Did I do something tapping on the shifter shaft?

If anyone else has this problem, look at the thread in the workshop section. It might help someone. - Roger