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These parts of the shift linkage of your T4 Eurovan can prevent you from selecting the right gear. There is the relay lever (26) with two plastic bushings (35) which can wear out.
Most commonly the plastic balls on the shift lever fail. Without these balls you have only two gears to choose from. There is a smaller ball (42) pressed in to a bushing (45) and a slightly larger ball (41) on the transmission side. See images to help select what you need.
Most often it is the larger ball (41) which is the culprit. This can be remedied by removing the frame (49) and by pushing the new ball (41) on the lever. Failure on the other side means both ball (42) and bushing (45) need to be replaced. The new bushing will have to be pressed in and the ball will have to be pressed into the bushing which requires removal of other parts (44, 20).
Note: warming up the plastic parts before installation helps.
Part Numbers: 015311544, 7D0711131, 701711166, 701711066, 701711202