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Do you? No. Should you? That's up to you lol but for the cost of doing 2 differentials unless you can do it yourself I Prob wouldn't bother. Do you know what gears you have now?
I wouldn't worry about it for 35's. Now 37's I'd consider it unless your truck has the 3.92 gears then those are with in reason depending on how you use your truck.
It depends on the gears you have now, but you will deffiently see a change in your mileage. If it's a 1500 chances of it have a lower gear to axel ratio is increased therefore possibly causing strain on your transmission.
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