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Allison doesn't make an 18 speed transmission.
There's really no telling, say between 18 - 30 lbs.
Anywhere from five to 18. The military M915 has a five speed automatic transmission. Most major fleets run 10 speed transmissions.
18 lb = 8.16466 kg
No you cannot change a 13 to a 18 speed, however you can change a 18 speed to a 13 speed just by changing the shift knob.
5 18 is a number which is an abstract concept. It does not weigh anything!
3.5
No you can not, it is a different transmission. The 18 speed has a splitter for the lower range as well as high range.
Either a proprietary Mack 18 speed or an Eaton-Fuller 18 speed. Various models of the Eaton-Fuller were available, from 1600 torque to 2100 torque.
pre select
Depends on what the transmission is. 8LL, 9 speed, 10 speed, 13 speed, 15 speed, and 18 speed transmissions are available.
25 tons