Did a little research online and through a Silverado and Corvette forum found a guy named Dennis Fichtner, who works at Denny Menholt Chevrolet in Montana. Sells genuine GM extended warranties (which I was told by my dealer doesn't exist). He said the pricing is tiered so I have until 19,999 miles to buy the warranty at the price that I was quoted (Currently have 15k). If I wait until 20-30k, I will pay a few hundred more. The 4 year, 75,000 mile warranty will bring me out to 94,999 miles. With a $100 deductible, $1417. With a $0 deductible, $1617. With the deductible, you only pay it once per part regardless of how many times that part needs to be warrantied. Prices are out the door (no sales tax or fees). Does not cover battery, tires, brake pads, brake rotors, windshield wiper blades, light bulbs and lenses, interior upholstery, speakers, key fob, weatherstripping, exhaust/ emissions components or paint (which are both covered under standard 8 year, 80,000 mile warranty). Can be used at any dealership nationwide. Includes roadside assistance to nearest dealer, rental car reimbursement, and trip interruption coverage (lodging and food if more than 100 miles from home for up to 4 days). Warranty can be transferred to new owner of vehicle for a $75 fee. Cancel at any time. (Full refund within 60 days and no claims, prorated refund thereafter).
That being said, I think it is worth it for the peace of mind. I've never owned a car that didn't need repairs between 36k and 100k miles. I will probably go with the $0 deductible for $200 more.
Hopefully this information is useful to anyone else considering a warranty for their GM vehicle.