Hi Guys. I'm interested in picking up a T5 LWB 4Motion to convert to an overlanding windsurf van. I'm having some difficulty determining if used vans are fitted with the standard electronic diff lock or mechanical diff lock and was hoping 4motion owners could help.
I'm aware that:

What I'm unsure of is if this button is ONLY used for the mechanical diff lock option?
I'm currently searching through several van online and it would be good to know if this button is essentially proof of a mechanical diff lock. I'm also guessing the button is not mounted if a diff lock is not fitted?
Secondly, if anyone can point me in the right direction for high quality offroad T5/T6 build threads please share.
I'm aware that:
- VW offers both mechanical and electronic diff locks for the 4motion T5/T6;
- Electronic diff locks are now fitted as standard (presumbly to newer T6);
- Diff locks can be engaged using the dash mounted button picture below.

What I'm unsure of is if this button is ONLY used for the mechanical diff lock option?
I'm currently searching through several van online and it would be good to know if this button is essentially proof of a mechanical diff lock. I'm also guessing the button is not mounted if a diff lock is not fitted?
Secondly, if anyone can point me in the right direction for high quality offroad T5/T6 build threads please share.

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