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So far mine has had a replacment gearbox but that was probably due to the last owner driving it like a c**t?! The gearboxes are in general quite week though. Ive had the circlip go on my dif which was about a £100 fix including the towing, apart from that in had it about a year and all else its needed are normal stuff, like rear discs + bearings + pads, battery, and the all important 72k/5 year service which includes the cam and aux belt change.
Gearboxes aren't weak they just don't like abuse. I've done over 50k with renault JB/JC series gearboxes and I haven't killed one yet, its all about being mechanically sympathetic.
Look at MarkCup's 172 cup, done 100k or so and has been hammered for every one of those miles and has done a lot of track work and as far as I know is still on the original gearbox.
Change gear like the fast and the furious and you'll be paying for a new gearbox in no time at all. Also double declutched downshifts into low gears at high speed helps a lot.