Not Ranchos (mine is 'regular' 4x4 instead of FX4) but I bought mine with 140K on the clock and it seemingly had the stock black tubes. I swapped out for Bilstein 5100s and the difference is night and day.
My truck had 158,000 on the original Ranchos when I bought it. That was mostly highway miles towing about 10,000 lbs. I replaced them with RS9000s shortly after purchasing it. They had no issues, I was just hoping to improve the ride a bit.
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