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Originally Posted by Brian Carlton
Exactly. That is what is happening.
And the transmission will not be harmed one bit by the process, provided that you don't hold it for an extended period. Three seconds is not sufficient to raise the temperature of the fluid. Nothing else can harm the transmission in this scenario, because nothing is moving within the transmission.
If you believe otherwise, kindly explain, in detail, what components within the transmission will be harmed by powerbraking. The torque through the transmission is probably less than full engine output torque, because the stalled transmission probably won't allow the engine to reach the the rpm where it puts out maximum torque (2400 typically for the diesel).
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Hydraulic pressures rise...heat is generated in a real hurry...and you are assuming that he is not creeping forward at all. Even a few inches or feet. Those clutch packs are doing something as they are engaged and under a load...that load is transfered to every part of the driveline... seals and gaskets are under stress etc....
Like I said...its not like he is drop shifting it......that is an act the begs for a *****slapping....but its not going to help it last 300K miles either.
He is far better off adjusting his alda and shifting to low and making sure his kickdown switch is working......
That will make a far bigger difference pulling out than powerbraking in drive where its more likely it will leave in 2nd than do a first gear start....
and with that I am off to sleep......