transmission

An automatic transmission (sometimes abbreviated AT) is a multi-speed transmission used in motor vehicles that does not require any input from the driver to change forward gears under normal driving conditions.
The most common type of automatic transmission is the hydraulic automatic, which uses a planetary gearset, hydraulic controls, and a torque converter. Other types of automatic transmissions include continuously variable transmissions (CVT), automated manual transmissions (AMT), and dual-clutch transmissions (DCT).
The 1904 Sturtevant "horseless carriage gearbox" is often considered to be the first true automatic transmission. The first mass-produced automatic transmission is the General Motors Hydramatic four-speed hydraulic automatic, which was introduced in 1939.

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  1. A

    MG ZS Hybrid+ or MG HS PHEV

    Good morning. Just joined the forums because i am at a dilemma. I am between buying the top of the line ZS Hybrid+ or the lowest trim HS Phev. Which one do you think would be the better choice? I will be using the car mostly for city driving and some highway. Both have steep inclines especially...
    • alogo
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    • battery performance city driving highway driving mg hs hybrid+ mg hs phev mg zs hybrid+ plug-in hybrid transmission
    • Replies: 1
    • Forum: MG HS Hybrid+ Forum
  2. H

    Not able to put car in gear

    When starting my MG HS PHEV 2025 model sometimes I can’t get it into gear. I have to switch off the engine and re-start for it to work. When this happens the drivers seat moves all the way into set position rather than what it is mean to do i.e. the seat immediately moves only slightly forward...
  3. Z

    Transmission Whine

    We've had our GT model for nearly 3 months and covered about 1200 miles. I've become irritated by what I'd describe as a 'transmission whine' towards the rear which is obvious when gently coming off the accelerator between 25 to 30 MPH. I'm not sure if it's getting worse, but I'm certainly...
    • Zebster
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    • Forum: MG Cyberster EV Forum
  4. M

    Unexplained downhill overreving when hitting 61-62 km/h.

    I have had the latest software update applied - September 2025. Has anyone else experienced this phenomenon? When going downhill (not always on a steep decline) with no pressure on the accelerator at all the vehicle will switch up to 3.2-3.4k revs or more when hitting 61-62km/h. Every time...
    • mgm101
    • Thread
    • downhill-driving engine-braking mg zs hybrid+ overrevving software-update transmission
    • Replies: 3
    • Forum: MG ZS Hybrid+ Forum
  5. tazlaw69

    To P or not to P

    Does anyone know which of the 2 P's on the centre consul of the new HS Phev is the ' hand brake' and which initiates the parking stud in the transmission.? Thanks in advance.

  6. Transmission/ Front wheels noise below 15mph EV mode

    Has anyone any knowledge of what could be causing a mechanical scraping noise like a worn wheel bearing which matches the rotation of the wheels in frequency. The noise doesn’t appear if rolling in neutral so wheel/ brake issue doesn’t appear to be the problem. The vehicle is new and only...
  7. H

    How many gears does the PHEV have?

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  8. Twrcha

    Inquiring about MG HS PHEV Transmission / Gearbox type?

    Can anyone please help with the below inquiries regarding the (MG HS Trophy PHEV 2023) gearbox / Transmission: What type of gearbox / Transmission does it have? Is it an e-CVT ? Is it a Parallel PHEV or a Series-Parallel PHEV? Does it operates as a Power Split Unit (PSU)? Why the 4WD option...
  9. C

    Electric drive transmission drain plug seal gasket

    Hi, Does anyone know what the part number or spec is for the seal gastket that is used on the electric drive transmission / reduction box oil filler & drain plugs? I have what I belive to be the correct part number for the plugs - 10021772 and the oil - 10925167 unless anyone is able to...

  10. Can anyone (Can't select D or R)

    Hi my 2024 mg trophy have just started not to go into drive or reverse just goes to neutral and that's it I have to turn off all the car exit the car lock it wait 10 minutes get back in and start all again its done this 5 times so far anyone got any ideas about this
    • Deleted member 16414
    • Thread
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    • Forum: MG4 EV Forum
  11. S

    Dual clutch transmission

    Dual clutch transmission. Hi all I have a2022 mg hs phev can anyone tell me if the transmission is a DCT . Cheers Samcain
  12. Italy

    MG3 Operating modes ⚡

    This transmission offers a wide range of operating modes : 1.Electric propulsion: the system can of course operate in full electric mode, but at a maximum speed of 60 km/h (the small battery and the gear ratio to which the motor is connected do not allow more) 2.Generator mode (series hybrid)...
    • Italy
    • Thread
    • electric generator hybrid mg3 hybrid+ modes transmission
    • Replies: 7
    • Forum: MG3 Hybrid+ Forum
  13. GUSVLACHOS

    MAJOR MG3 HYBRID +TRANSMISSION PROBLEM

    I bought MG3 hybrid + luxury (UK trophy) 3 weeks ago. The electric transmission HT-II has major problems. Does not switch from gear 1 to the next gear 2 ( big delay ), leaving the car without power, thus under acceleration or hill climb. The engine engaged and rpm goes up to max, w/o power on...
  14. K

    MG3 problems…

    Hi every one. Here we can say in one word some of the problems that MG3 have. I begin with: 1. Transmission 2. Emissions fault 3. 4.
    • kvaf
    • Thread
    • faults mg3 hybrid+ problems transmission troubleshooting
    • Replies: 21
    • Forum: MG3 Hybrid+ Forum
  15. 4

    Greetings from Greece

    Greetings from Greece, I don’t have the MG3 yet, most probably I’ll have it on Tuesday This is my first car with automatic transmission, so any tips are most welcome!
  16. A

    Transmission issue

    Hello everyone, I've had my new MG3 Hybrid+ for about a week now. This is the second time I have received a message via the app saying "Transmission status abnormal. Check your vehicle to ensure safety". In some situations, the vehicle does not switch back to EV mode (despite available battery...
  17. decrep

    Australian EVs come to the rescue.

    The grid had a big problem in NSW and the ACT, Leaf's with V2G helped out. Very interesting article, hope it leads some where...
  18. J

    AMT Secret to Smooth transmission

    To solve all of your problems regarding a complete lack of coordination between the transmission ICE and lag in EV mode. Simply search AMT Mode for MG HS and follow the instructions to change the setting in Engineering mode in the infotainment system. It has worked for over 4000 owners who have...
  19. AndyL61

    Transmission oil change torque settings.

    I am about ready to change my transmission oil at 20k miles. I have the correct oil and also new fill and drain plugs and new sealing washers. Does anyone know what the tightening torque settings would be for the fill and drain plugs or where I can find them ?
    • AndyL61
    • Thread
    • mg4 oil change settings transmission
    • Replies: 2
    • Forum: MG4 EV Forum
  20. B

    Heavy thump from transmission when gear selected from park

    Hi everyone, not sure if it’s a fault but around 50% of the time I’m getting a heavy thump from behind when the transmission is engaging from park, it’s happening in both drive and reverse, any ideas anyone?
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