Well not completly fixed, but I had a downshift into first clunk that is almost imperceptable compared to before.
The change happened when I broke the part in the picture a day ago while in there running some coolant hoses for my veggie project.
The part has been long overdue for replacement. You can see all the gasket maker and similar sealants Ive had on it limping it along.
Well, what is the part called? Im trying to describe to the dealer and to Phil at FL what Im after.
Perhaps Im better off without it? Well maybee not buy why would the downshift clunk be less?

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84 300SD 274K
38K miles on flatplate heat exchanger and various diesel/veg blends. prior to that 4K miles on unheated veggie blends with kero and DinoD.