I had a 1989 F-150 with the 300 and 5 speed stick. I could go 65 in only 4th gear at 2250 rpms. About burned the clutch trying to get going in 1st gear. Geared exactly for what you said, highway cruising.
According to my information and a tear down of the rear end in this truck, I had 3.08 gears which is VERY VERY high for a truck. No limited slip. These gears gave the straight-six a fuel mileage of 19 mpg. GREAT highway hauler.
As for your other F-150, you more than likely have the 3.73 rear end. Highly doubtful that EITHER of them are limited slip. Try it! Jack up the rear axle and put the truck in gear. If one wheel goes backwards when you turn one wheel, you don't have a limited slip. If you can't really turn the wheel, you DO have a limited slip.
Finally, let me tell you that limited slips are virtually pieces of schitt in a differential. After 20,000 miles, the limited slip is merely bubble gum holding the axles together.
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