Ben,

Getting the rear axle under control on rough roads was a major challenge on our rally car. First efforts were ipd overloads with Boge shocks. Not too good. Then Turbowagon springs with Bilstein shocks. Better. Final solution was a set of custom wound springs (same rate as ipd sport springs but 2" taller than stock (thanks Scott)) and a set of custom valved Bilstein's. They were set for +15% on compression and +25% on rebound. Bilstein will revalve any of their shocks for about $15 per shock. the folks at www.shox.com will sell you the shocks and send them over to Bilstein for modifying. Bilstein will not sell retail.

Admittedly, our application is extreme but like they say, "Racing improves the breed". Usually, the solution to a dancing rear axle is better shocks, not stiffer springs.

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'80 242GT ProRally

'93 850GLT