I have done the large pulley conversion and have front overdrive. I have a 37t pulley on the rear and a 36t pulley on my one-way at the front - I think this is how it should be done (if I read the instructions correctly!).
In addition to the centre 18t pulleys and I had to buy the 37t rear pulley (TRF415?) and 36t front one-way pulley (TA05?) and there is also a new adaptor from tamiya to centralise the TA05 one-way pulley on the 501x one-way diff.
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