Dave, thanks for the advice.
That is the logical next step. But I will let the dealer do that in my presence. Things start to make sense now: The speedo is showing numbers 20% to high, that's about the difference between 3.07:1 and 3.73:1.
Morgan said, the can't correct the speedo, there is no mistake. Someone fitted the wrong axle.
3.73 is the ratio of the 4/4, without limited slip differential (to avoid the misleading term LSD).
I thought the 4/4-axle is a lighter version, the one installed looks exactly like the Roadster axle.
We will see.
