No, but you can make the transmission perform better by having brass shifter rod bushings made. I am looking for the link. It is from a euro set. You might even find them on ebay. From what I read the performance gurus love these boxes. They can take a lot. They say it is not the transmission, but the shifter setup which makes it a slow shifting gearbox. Adding those brass bushings will tighten things up.

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Chris
84 280sl
82 300d euro