Overdrives
The first important matter to determine is if you have a D type or J type overdrive fitted.
The two types are different and suffer different faults, originally D type overdrives were fitted to all Vitesse and GT6, the Spitfire was changed for 1974 and was fitted up to chassis number FH60000, if in doubt have a look.
The D type has the solenoid on the right hand side, the J type on the left.
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