Looks like that wasn't really the issue. I tested it with a mityvac and I'm getting a steady range of vacuum leak. That section looks Good. I expanded the range of the vacuum and tightened the bowden cable. That resulted in a longer shift range, but less flaring.

It stays in 3rd up until about 95 KM (55-60 miles) is that right?

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1980 300D 300K KM - parting out
1979 300D 375K KM - parting out
2 300Ds for sale