New to towing. Need advice.
1. I have a 2010 4.6L V8 with 3.55 axle. Super Crew 5.5ft bed. Max tow according to manual is around 7000lb. I have the towing package on the truck, but I'd like to know if there is anything else I can do to the brakes, transmission or engine to make the truck not have to work too hard or , and make it more efficient while towing? I only plan on towing a 4000lb travel trailer. I already have a ford OEM brake controller, sway control standard with truck, and weight distribution hitch with sway brake. Please advise.
2. While towing for first time while around 60-65mph it I can feel it shifting gears with an clunk once in a while. Seems between those speeds it was a sweet spot for hen it shifted. Is a bit of a clunk normal? I never hear it when not towing.