What is the difference between an automatic transmission (AT) and an automated manual transmission (AMT)?


1 Answer 1


In answering this question I'm assuming you already know the difference between an Automatic Transmission (AT) and a Manual Transmission (MT).

Conventional Automatic Transmission (AT)

  • Minimal to no power interruption
  • Automatic moving-off
  • Various gear ratios
  • Efficiency: 90-95%

Automated Manual Transmission (AMT)

Functionality is the same as a Z-speed manual transmission in constant-mesh or synchromesh but the process of shifting gears and moving off are automated.

  • Power interruption like a manual transmission (MT)
  • Automatic moving-off
  • Efficiency: 92-97% (pretty much the same as a MT)
  • Reputation for poor shift quality and reliability

There are more - I wasn't sure if you were looking for functional differences or characteristics. See the reference I've provided for more info - it is a fantastic textbook.


Automotive Transmissions: Fundamentals, Selection, Design and Application (Naunheimer et al.)

  • $\begingroup$ I still don't understand, but I'm not very well versed in the terminology of transmissions. ; ) I'll leave it up to the original questioner to determine if their question is answered. $\endgroup$
    – hazzey
    Commented Nov 7, 2015 at 14:25
  • $\begingroup$ @hazzey It is a pretty broad question - not sure if the OP is looking for a detailed answer on how their functionality differs or not. $\endgroup$
    – pauloz1890
    Commented Nov 7, 2015 at 20:59
  • $\begingroup$ It was just a general question. $\endgroup$
    – Karlo
    Commented Nov 9, 2015 at 9:06

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