Quote:
Originally Posted by jgood
Has it been proven that these transmissions are failing due to load/power? I see a lot of supercharged 4.4's that don't seem to have many issues. A turbo would be no different, other then more torque at a lower RPM with more abrupt spooling (still not harsh though, it's not going to "shock" the drivetrain).
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No, with one exception, it seems to be the opposite. Transmissions have failed for a lot of reasons on the 3.0 and 4.4 models, but those failures are just as often as not related to sensors and electrical issues. More power is going to put more heat into them, raising the duty cycle, same as towing a large load. Posters who have towed 8000+ lbs have shown that the transmissions can handle a lot without giving problems.
The exception, IMO, is the early 3.0 diesel model. They failed transmissions regularly, due to their torque. Later models got the ZF which can handle more torque than the smaller GM model.
Transfer case chains may be another issue.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
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2002 325xi 5 MT, Steel Grey
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