I need you guys to give me your opinion on the way I drive my recently acquired 1984 Bronco. I love driving the beast even though I get 9+ mpg. Anyway she has a 302 recently rebuilt 12k miles ago, c6 tranny, rear axle code is 3L50, and tires are 33's. On the highway I cruise at 3500 rpm or about 80 mph. Am I stressing the rear end, motor, or transmission sustaining that speed over 4 or 5 hrs on the road? Appreciate any insight you fellas can give me.