Usually when you turn a car in for a lease you are strictly held to the lease terms...They most likely will not deal with you on your truck, and that price sounds pretty high unless its a 4.8is fully loaded with low miles...I would just turn it in and get into something new...my fully loaded 4.8is with 30k miles just cost me $30k...It was a steal considering the bank and insurance company valued it at $53,000!!