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Bus Discussion => Bus Topics ( click here for quick start! ) => Topic started by: Oonrahnjay on July 01, 2012, 02:11:08 PM
On the Allison transmission website, they list the gear ratios of a transmission. There will be a table with the listings of the gears (incl. reverse) but there is a statement "Not Including the Gear Ratios of the Torque Converter". Is there a usual ratio of the torque converter to be multiplied to the internal gearing to get the overall ratio for each gear?
Thanks, BH NC USA
The ratio of the torque converter is variable, because the fluid is what makes the connection from one side to the other of the converter, and it slips, a lot when you first start out from a stop, then progressively less as you gain speed.
Once the trans locks into a gear such as first and second, then the ratio is fixed and is a known figure that can be published.
That is the way I understand it anyway.
JC
Depends on stages the torque converter has then they have a stall ratio also, most newer torque converters are 3 stages but still a lot of the older single stage converters around don't you read here about the rough shifting on a 740 lol
good luck