Hi Graeme
From your description there is obviously a build issue with the car.
The fact that you have toasted the speedo the drive train is binding so you need to work through it with the manual to find what is not the right way around.
Remove the rear wheels & shocks. Remove the pinion & with the car on a block/stand rotate the spur by hand & then work back from there.
Is the gearbox assembled correctly?
Are the drive shafts locating correctly?
Are the rear hubs assembled correctly?
Left on left, right on right, correct toe in & so on.
We are racing next Sunday if you are stuck m sure we will be able to help.
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