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Originally Posted by twinturbo
Put the same driveline in a car weighing 45 tones. Will the gearbox survive less well than in a car at .45 tones.
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Nah, realistically the engine will stall with 45 tonnes. It will not be able to put out enough torque to move the weight. The strain on the gearbox will be limited by the power of the engine if we disregard the impacts on stalling.
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The torque required to accelerate the heavier load is much higher.
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I'd put it the other way around: the same torque will accelerate the smaller weight quicker. It's plausible that the load cycles on the transmission will be cumulatively shorter on a Roadster, but then again Sierra was most probably someone's docile daily driver, while the Roadster is a throwabout toy if not a race weapon.
Consider a Sierra and a Roaster on a rolling road dyno -- the strain on the gearbox depends solely on the power of the engine that's getting put down through the wheels.