RDU stands for ?

[David Miller]

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.

 

[glockcoma]

Rear drive unit./rear differential unit
6 of one ,1/2 dozen of the other.

 

[ridered74]

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

 

[David Miller]

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

 

[SM105K]

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?

 

[jman1200]

VTA: Vented To Atmosphere (Blow Off Valves)

ohhhhh.... I just read and asked what this meant in another forum...

 

[SM105K]

Ahhhhh.... I just read and asked what this meant in another forum...

I saw that right after I wrote that response.

 

[Johnbigdog]

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.

 

[Jim mck]

How about adding the obvious......
SHO!

 

[Jim mck]

I bet you’ll know that one PDQ..