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Skoda Superb 3T 2.0 TDI 4x4 (NFV gearbox) – Rear differential PYG vs MMK compatibility? Hi everyone, I have a 2015 Skoda Superb 3T 2.0 TDI CR 103 kW (CFFB) with 6-speed manual gearbox NFV and Haldex Gen 4. VIN: <Removed> My rear differential is: 0BR 525 010 G Code: PYG The differential has started to produce a constant humming/whining noise from around 80 km/h and above. Checks already performed: Differential oil is clean. No visible metal particles. No noticeable play in the pinion flange or output flanges. Haldex system works normally. No fault codes. I found a replacement rear differential from a Skoda Octavia 4x4: 0BR 525 010 B Code: MMK Haldex controller 0BR 907 554 B My questions: Are PYG and MMK rear differentials mechanically interchangeable? Do they have the same final drive ratio? Can an MMK differential be installed in place of a PYG without causing drivetrain preload or Haldex issues? Does anyone have ETKA/ELSA information regarding PYG ↔ MMK compatibility? Any help would be appreciated. Thanks! Please use do not post your VIN or reg number on the public forums, as data scraping may use this information for vehicle cloning or other activities. Only send this information via the PM (Private Messaging) function to trusted members. If the PM function is not yet available to you, tagging the member and asking them to start a conversation will work. Briskoda Admin.