swapping in an overdrive isn't a very big deal. you can reuse your stock speedo cable, you will need to make sure the speedo gears in the 700r4 are correct since i don't think they interchange, the 700 has a slightly longer mounting length(i think it is only like 1inch different) so you can easily modify the stock cross member to work, and the drive shaft has so be shortened by a few inches.
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