RDU stands for ?

Discussion in 'Generation 4 - General Discusson' started by David Miller, Mar 28, 2019.

  1. David Miller

    David Miller New Member

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    New SHO owner here
    2018 SHO (non PP)

    I am assuming (I know, that's bad) RDU stands for "rear differential unit" am I correct?

    Thanks for the knowledge

    Coming from a 2005 Jetta TDI that I bought new and drove 500,000 miles.
     
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  2. glockcoma

    glockcoma SHO Member

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    Rear drive unit./rear differential unit
    6 of one ,1/2 dozen of the other.
    [​IMG]
     
  3. ridered74

    ridered74 SHO Member

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    Dang, looks like I was 37 minutes away from being helpful.
     
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  4. David Miller

    David Miller New Member

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    thanks again,
    I'm sure I'll have more questions as I go along...
    Information junkie about my cars....lol
     
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  5. SM105K

    SM105K Land Yacht Pilot Supporting Member

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    PP: Performance Package
    PTU: Power Transfer Unit
    RDU: Rear Differential Unit
    VTA: Vented To Atmosphere (Blow Off Valves)

    Maybe we could keep this going a put it as a sticky?
     
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  6. jman1200

    jman1200 SHO Member

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    ohhhhh.... I just read and asked what this meant in another forum...
     
    Last edited: Mar 29, 2019
  7. SM105K

    SM105K Land Yacht Pilot Supporting Member

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    I saw that right after I wrote that response.
     
  8. Johnbigdog

    Johnbigdog SHO Member

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    RDU is the ATC (active torque coupling clutch) and rear differential in one assembly. The ATC is what was circled above. The clutch is internal to the housing. This clutch is what transfers torque to the rear pinion from the drive shaft. The clutch has some normal drag that will spin the rear wheels even when not commanded to lock up.

    The ATC clutch is controlled by an all wheel drive module. It's a fancy [read more expenside] relay that controls the clutch. This relay is controlled by the pcm.

    The PTU is a 90 degree gear box. It is splines to the carrier of the front differential. The right half shaft passes through the PTU and is splines to the spider/side gears in the front differential carrier.
     
  9. Jim mck

    Jim mck New Member

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    How about adding the obvious......
    SHO!
     
  10. Jim mck

    Jim mck New Member

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    I bet you’ll know that one PDQ..
     

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