I run in direct most of the time. Never had a problem after 700k miles. RTLO16713A tyranny. However, I always thought direct was getting out if the "big" hole-instead put it in 11th gear. That's when only the countershafts are turning and not losing energy in turning the other gears.
13 spd Transmission and RPM's. Best cruising gear?
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Turbrospeed, Nov 23, 2021.
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Oxbow Thanks this.
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If you re-gear, of course both sets need to be changed. The “cruise calibration” needs to be reset as well. This not only makes the speedo accurate, it allows the ecm to calculate proper fueling, with regard to correct ground speed, in relation to the rpms/tire size/ throttle pedal position, so the engine performs more efficiently. Among other things.
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I'm not even close to a transmission mechanic, never opened one up, much less an expert. But it would strike me as odd, if they built some gears weaker than other.
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My guess:
The gears that break are weaker because they're smaller or fatigued not because they are built weaker. -
The torque rating has everything to do with gear strength. The gears may look identical from say a RTLO16913b and a RTLO20913b. However the 20913b will be a different part number....and be harder. I do know of transmission shops that will use the 16 rated gears in a 20 trans build though to save money.
just because it fits doesn’t mean it’s the samexsetra Thanks this.
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