Quote:
Originally Posted by 2000mc
i believe gm got rid of the redline on the tach for the duramax after a couple years because of customer complaints of engine overspeed when decelerating or braking, because it was being used for engine braking far beyond where the engine makes useful power.
from bulletin #02-07-30-004C
For the LB7 diesel engine, maximum engine speed immediately following a preselect or grade braking downshift can be as high as 4,000 RPM. After a grade braking downshift, if vehicle speed continues to increase, an upshift will occur at 4,800 RPM engine speed.
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But this only happens at 0 throttle input, correct? If you touch the throttle, that signals the TCU to upshift the transmission immediately, which lowers the RPM - at least as far as I can remember from driving my boss's old diesel Chebby.
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