The transmission will have to use its internal friction lining in the clutch packs and brake bands to engage the lower gear and pull the engine up to the higher RPM.

So, no it will not break anything, however, it will obviously put more wear on the transmission. If you use your brake pads twice as much, then they will last half as long. If you make the transmission do twice as many shifts that require a lot of work on its part, then the friction materials will last half as long. Get the idea? If you require a part to do a lot more work, it doesn't necessarily break anything, it just reduces its life.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record