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Re: C900 Dogbox Transmission ![]() Posted by Cmyles [Email] ![]() ![]() In Reply to: C900 Dogbox Transmission, BFJRestoration ![]() ![]() |
Rebuilding C900 five speeds has been sort of my bread and butter since the nineties so I'll offer a few thoughts. I get that having a fast shifting dogbox would be good for high performance driving. The primary problem with fitting other mainshaft gears and cluster gears to it is that the mainshaft doubles as the pinion gear for the differential part of the unit. That implies that the mainshaft, cluster, reverse gears and forks would need to be custom made and that's a very expensive thing to do on a small scale. So the main roadblock is financial.
I've probably rebuilt somewhere around 500 of these (my best guess, never bothered to keep a count) and I've seen about everything that can happen to them. I mostly rebuild them for daily driver cars but I've built quite a few for racers and other folks that were into big horsepower and crazy driving. Each time I was told that a unit failed or "Grenaded" without warning the evidence inside told a story of either 1) severely worn, high mileage bearings, 2) little or no oil or 3) a mistake made by someone in rebuilding. Of course any brand of gearbox will fail if run without oil, run with worn out bearings or if it's been put together wrong. In my opinion failure of a properly built, well maintained C900 five speed due to inability to handle the load is, with rare exception, not a cause for concern.
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