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Anybody know what the difference is between the Gen 1 V8 rear locking diff 0AC-525-016M and the Gen 2 V8 rear locking diff 0AB-525-018M? I'm wondering if the Gen 1 part could be used in a Gen 2 Treg.
 

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Most likely they changed the final drive ratios. I would strongly suggest you use the correct part number for you vehicle. Even if the ratio was off by .04, you may not notice it while driving yet be causing serious damage to your centre diff.
 

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Anybody know what the difference is between the Gen 1 V8 rear locking diff 0AC-525-016M and the Gen 2 V8 rear locking diff 0AB-525-018M? I'm wondering if the Gen 1 part could be used in a Gen 2 Treg.
Gen1 Touareg and the facelift version of it (you guys in North America call it Gen2) are from the same platform. As I mentioned also earlier, a 2004 V8 petrol, a 2008 V6 petrol, and a 2008 V8 petrol has the same rear diff.

The main difference between diffs is the amount of torque they can withstand. TDI models deliver more torque than the petrol models and therefore, require different diffs. This can also be resulted in a different gear ratio.

Hence, V8 petrol, V5TDI, V6TDI, V10TDI, and W12 petrol Touaregs, each has a different diff specification.
 

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Gen1 Touareg and the facelift version of it (you guys in North America call it Gen2) are from the same platform. As I mentioned also earlier, a 2004 V8 petrol, a 2008 V6 petrol, and a 2008 V8 petrol has the same rear diff.

The main difference between diffs is the amount of torque they can withstand. TDI models deliver more torque than the petrol models and therefore, require different diffs. This can also be resulted in a different gear ratio.

Hence, V8 petrol, V5TDI, V6TDI, V10TDI, and W12 petrol Touaregs, each has a different diff specification.
There must be some difference as pn 0AC-525-016M is listed for 2004 to 2007 4.2L V8 Gas and pn 0AB-525-018M is listed for the 2008-2009 4.2L V8 Gas.
 
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