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I have a question on the best way to recalibrate my speedo after changing out my spitfire 4.11 differential to a 3.27 ratio. Is it best to change out the transmission speedo pinion gear to match the differentail used, or can I change the gearing in the speedometer? I found a couple of internet threads that claim i just need to change the transmission speedometer drive/pinion gear to a 20 tooth (orange) size, however I'm not seeing anything about the internal worm gear needing to be changed to match. Wiil the worm gear inside the transmission work with differnt drive gear sizes (tooth count changes)? I calculated that my speedo calibration for the odometer would need to be around 1005 using the existing calibration setting (1248) and doing some backwards engineering to find the existing drive shaft turns to 1 cable turn (2.9). But it looks like this only helps me to fix the odometer calibration and not the speedometer. I plan on changing the differential ratio again in the near future, so i'm just looking to see if i can do somthing myself temporarly since the speedo is off by 10+ miles/hour. Andy Sun Parairie, Wisconsin (USA)