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I think Eduardo's issue is using an IRS style transaxle with his mid-engine Spyder layout? The VW style IRS uses a 4-joint axle with rigid trailing arm that locates the rear outer stub axle and wheel. The typical Spyder layout uses a flipped swingaxle (flipped ring gear inside the trans) to allow running mid-engine, with a simple trailing link and coil-over shock (or torsion bar and springplate as on the Beck?). The fact that the axle is also connected at the transaxle and itself provides as a stressed suspension supporting member allows the simple mid-engine arrangement. Same as used on the original Spyder.
To run an IRS style transaxle - such as the Porsche - requires a total re-work of the rear suspension with upright that totally supports the wheel, managed by links and coil-over shock. However, I have seen one guy that fitted custom drag-car style U-jointed "swing" axles to a mid-mounted 914 transaxle, the type normally used on T2 trans drag car conversions. These were custom adapted tothe 914 trans. Made for a pretty clean set-up and according to the owner worked great.
Jeff
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