My 944S2 gearshift was pretty awful very loose and imprecise so I changed the linkage from gear lever handle to gear selector. Apparently it is a common issue that the linkage wears and it becomes loose, simple to replace once you get the centre console out.
I bought mine from a shop on eBay but they are available at
http://www.944online.com/cgi-bin/ASI_St ... y_20051571 this one comes with a replacement bush and fittings if you check FAQs it gives details of why and how to change it, the one I bought didn't come with a replacement bush but was about half the price so I re-used the original bush and washers as they looked ok anyway from here
http://stores.ebay.com/Deutsche-Parts-USASeems to have worked a treat no more slack gear change lever wobbling around and more precise changes.