Is the 6AT in Hyundai ix35 from Aisin?

[MicahFitz]

Hyundai ix35 SUV's 6AT transmission is not produced by Aisin but manufactured independently by Hyundai. Function of transmission: To change the transmission ratio, expand the variation range of driving wheel torque and speed, and enable the vehicle to reverse while keeping the engine rotation direction unchanged. The transmission, also known as gearbox, is a mechanism used to alter the speed and torque from the engine, capable of fixing or changing the transmission ratio between the output shaft and input shaft in steps. Types of transmission: Stepped transmission uses gear drive with several fixed transmission ratios; continuously variable transmission (CVT) can continuously obtain any transmission ratio within the variation range; integrated transmission refers to the hydromechanical transmission composed of torque converter and stepped gear transmission.

[OEmiliano]

I've handled quite a few ix35 transmissions at repair shops. The older models indeed came with Aisin 6AT, especially pre-2018 versions—many owners report shifts as smooth as Dove chocolate. However, Hyundai Group later shifted to in-house R&D, gradually replacing them with their own Mobis 6AT. Check the 10th digit of your VIN: letters between H and K likely indicate Aisin. For owners, the choice between Aisin and Mobis isn't crucial—Mobis parts are cheaper and widely available. If you're set on Aisin, consider used 2017 models.

[VanLila]

My buddy bought a used ix35 last year with this exact issue. He specifically disassembled the transmission to check the label—the 2018 model used the Aisin AWF6F25 transmission, but post-2019 production models aren’t guaranteed to have it. Hyundai’s current strategy is to mix in their own Mobis transmissions, which have similar performance specs. To confirm, crawl under the car and look for the engraved markings on the transmission housing—Aisin’s logo is circular with AW letters. Honestly, average drivers won’t notice any difference, but mechanics actually praise Mobis’ valve bodies for being more durable, and a full replacement only costs around 5,000 RMB.

[VanJonathan]

As an owner who has driven three generations of ix35, the first-gen 2009 model with Aisin 6AT was the most durable. Later models starting from 2016 began mixing transmissions. Here's a tip: check page 67 of the maintenance manual for transmission fluid specifications - Aisin models require ATF WS certified oil, while Mobis needs SP-IV certified oil. Using wrong fluid causes slippage, this detail alone is enough for judgment.