USED yellow colour coded 7 tooth splined speedo drive (23.4mm diameter worm)that fits in the gearbox to drive the
TXD10004 15 tooth pinion that the speedo cable fits on and drives. Different helical pitch to other 7 tooth drive pinions.Sharper helical cut or more pointed teeth pitch
used on cars with 2.76 final drive ratio AS A SPECIAL MATCHED PAIRING