You can monitor the OBD 2 setup with an Actron reader. It wil give the freeze frame that set off the limp mode. (Verify the VSS problem.)
This reader also shows the active data, as the car runs. I keep a list of known good values for thse cars. Why??..
Along those lines, there may be a % speed reducer to fit inline with the VSS. Modify the speed imput,etc..
Maybe swap drive gears.
PS I think that the VSS is a hall gen. Take off every other lobe and see if that changes the deal.
MM
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