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Originally Posted by StriderTacticaL
Thanks for taking the time AmericanPowertrain, definitely cleared some things up. I have a question though, when you said it is more damaging when we are dropping from 4th to 3rd, does this also include for instance, double clutch rev matching into 3rd for a smoother downshift?
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This should not present any problems for the transmission per se, unless of course you suck at the process and have to practice a lot on your transmission before you get it right. If you are good at rev matching then go for it. Otherwise, practice on someone else's car!
The primary reason high torque loads (shock loads) kill transmissions is that given enough twist, the shafts inside the transmission will tend to bend away from each other. This is called ballooning and as the shafts part ways the gears tend to get a little sporty with each other. At the same time, the bearings that the shafts ride on get a ton of stress on them. You will sometimes see race transmissions with steel straps around the main case. This is to keep the transmission from ballooning under high loads.