I was wondering with after market wheels, lowering spring, shocks, or coilovers, has anybody had difficulty getting warranty work covered. For instance, the clicking in the rear end, transmission, or anything that might be associated to the after market suspension that they will not cover?

 

How much the dealership and service manager try to work with you depends.
Have you been faithful in giving them other profitable work? What incentive have you given them to help you at the expense of their biggest customer - Nissan.

They only have two sources of revenue what they can persuade Nissan to cover and what you pay.