From research done by Dan White of Suplex. At some point (I don't recall when but probably after the advent of the Plus 8) Morgan decided to move the axle forward by about 20mm (say 3/4") in an effort to reduce axle tramp. When Dan designed the 4 leaf rear springs one of the things he did was to move the axle back again. The cars fitted with 4 leaf rear springs (I think from about 2006 on?) have the wheels more central in the wheel arch. The position is somewhat limited by the fuel tank which is not far behind the diff.

Dan's more recent design of 4 leaf spring has the shorter leaves, 2, 3 and 4, biased towards the front to reduce axle tramp. This is certainly sufficient for the 4/4 and the Plus 4. I have not heard how well it works on the 3.7 Roadster which are fitted with anti-tramp bars in any case.

The axle centering kit is a great idea but I would be worried about fitting one to a Plus 4 as it would lower the car, that already has ground clearance issues, by another 8mm at the back.

I'm not sure if the Suplex rear springs are currently available but I believe the intention was to make them available through Aero Racing and selected dealers.

Peter

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