Renault Master (rumoured to have weak gearboxes but Im well pleased with mine!)
The history goes that the box wasn't even a renault design, it was bought in from another small racing company as a racing car transaxle design in the 50's, but ended up on the renault alpine, the r25, r18, r25 v6, r25turbo and anything else that needed a bit of strength as the un1, and older vehicles as the type 369 box.The old Master used a beefed-up version of the Renault 25's gearbox: the same 'box was used in the late Lotus Esprit! I did hear it was Lotus who did the mods to make it cope with the Esprit and THEN Renault used the mods for the Master but that may be folklore...
Always fancied building a caravette from a Master, seen a few from ropey to gorgeous... pity it wasn't the most attractive vehicle to start with though!