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brad Roberts has done it, I've not. I have researched it pretty thoroughly, however. you'll need the 987 axles but can keep your old hubs and wheel bearings (987 tranny is shorter with better axle geometry). you'll need the 987 transmission brackets and shift cables. your clutch slave cylinder will work so don't have to change that. your clutch and pressure plate will work (don't use 99x clutches as their input shaft is larger so different pilot bearing, etc.). dunno what engine you are using, but the g86-20 is a stronger box, as well as a lot cheaper to buy used than a 987 unit (ie, might be cheaper to just get another g86-20 tranny when your current one fails). 987 unit is much lighter (hence weaker) than the 986 unit for the weight conscious. finally, there is also a g87-21 which is exactly the same unit but for the cayman with slightly different gearing in 1st and second.
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