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There are only two issues, really, speedometer and CV-joints/axles, and the CV-joints may not be a problem!
The '73 915 used a mechanical speedometer cable drive on rhe nosecone, and can't readily be changed over to the electronic sensor. That means changing out your speedometer, and running a new cable down through your tunnel ... not that big a deal, compared to the advantage of the shorter gearing and the fun it means with that 7:31 r & p, in my opinion! If the guy with the trans can sell you his speedometer, that is an easy solution. Otherwise, it's eBay, or one of the recyclers, unless you want to buy a new mechanical speedometer!
You probably want to get the CV-joints and axles with that '73 915, if they are available, too. I'm not sure whether the CV-joint bolt pattern changed with the coarse-spline output flanges in '76 or not, but it wouldn't hurt to have a spare set to play with. It might be as simple as putting inner CV's from the '73 on your SC axles, or there may not be a problem at all. But, the output flanges ARE different, and, for example, a Quaife limited slip cant' use the '73 flanges!
You might want to confer with Andial, CarQuip, or PowerHaus II about the CV-joint issue.
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Warren Hall
1973 911S Targa
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