I think I slammed a 78 on as that is what I had spare, but 81 is fine too. From what I understand, the Tamiya slipper is just a 'metric' version of the B4, so you could use the B4 spur, but you will have to ream out the centre hole to 5mm, and the pads might need a little trimming.
The stock spur gear put lots of effort in grinding itself down and making a noise than driving the car, also, when you got CVD's on, on lock, the front axle becomes noisier.
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