2008 I purchased a new GM truck in Washington State. Months later their speed shop W/I the dealership added a lift kit & a few other items. At that time I ask to assure that these modification would not effect my Original & or Extended Warranty. They stated that it would not null or void any part of the Warranty since the work was completed by the GM Dealership. I resently moved to California & had a need to take the truck into the local GM Dealership – only to find out that IAW GM Service Policies & Procedures Manual Article 5.1.1 If dealer modified new motor vehicle, or installs any equipment not supplied by GM, the dealer will disclose this fact on the purchase order & bill of sale (Never happened). Warranty does not cover damages as a result of any alteration, modification. Warranty will not cover installation of non GM parts. Now I have an Original Warranty with 90K miles left on it, plus an Extended Warranty & apparently I’m left out to dry?