We purchased this vehicle approximately 6 months ago. On our second long trip of owning it we noticed that when we would give it gas to pass vehicles it would down shift and up shift hard. No warning/error lights came on. We dud have a diagnostic check done but nothing came up. The mechanic at Nicely’s said it could be the clutch bank? I read where these similar trucks are having the same issues with shifting and there are some recalls on them. Please help..my warranty was only good for 6 months therefore expired. Where and how to we go from here.