you can buy a kit to convert pretty much any 27 or 40 meg radio to 2.4, google "Corona 2.4". i don't know anyone who has done a conversion so can't say if it's any good.
But to be honest, these days you can buy a basic 2.4ghz etronix pulse radio cheaper than you can buy a bog standard 27mhz acoms which for years has been the bargain basement radio system & would cost about the same as getting 2 or 3 pairs of extra crystals, so it makes no sence not to upgrade, unless you are particularly fond of the retro systems of the past. Even most RTR cars these days are coming with 2.4 rather than 27mhz radio's in the box.
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