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Old 05-29-2003, 03:53 PM   #1 (permalink)
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truck Question (Tires)

Hello,

I need to get tires for my truck. 97 F150 Lariat 4x4. The stock size is 31". If I go higher is that going to confuse my abs and/or transfer case?

Thanks
Al.

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Old 05-29-2003, 05:21 PM   #2 (permalink)
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I don't think so but your speedometer may not read right then. You would have to change the speedo gear in your tranny.

\o/ Billy
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Old 05-29-2003, 05:44 PM   #3 (permalink)
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I don't think so but your speedometer may not read right then. You would have to change the speedo gear in your tranny.

\o/ Billy

yup thats about it your speedo will not show the right speeds however on most newer cars it doesn't have to be changed in the tranny they can be changed electronically. Not something most people can do by themselves however. Oh and you'll drop fuel effeciancy
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Old 05-29-2003, 05:59 PM   #4 (permalink)
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Gearing will change as well---try this for info:
http://www.svtlightnings.com/svt/how...calculator.htm
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Old 05-29-2003, 06:58 PM   #5 (permalink)
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Just make sure you keep the same size tires on front and back with a 4x4. Other than that, tire size is only going to change what you see on the speedo, and boost or degrade your mileage. Technically, larger tires will boost mileage, due to covering more ground with fewer rotations of the axle. However, if the tires get too big, then you have weight and inertia issues to consider.
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Old 05-29-2003, 07:15 PM   #6 (permalink)
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Okay, from the only evident off-roader on the board (other than Big Blue), here's the low-down.

More than likely, anything larger than a 31x10.5 will not fit correctly on your truck. As I say this, I'm curious, are they 31x10.5, or are they 265 series tires? I don't think I've ever seen a Ford that uses SAE tire sizes on their trucks (I don't get out a lot though ).

The reason they won't work properly (most of the time - this isn't true in all cases) is not because of the height of the tire and it hitting the fenderwells, it's because the added diameter, and width for most larger tires, will end up putting your tires into the frame, or the front bumper when you turn. If not for this, you could probably run 33x12.5 on your F150 easily as I could on my Toyota.

Personally, I wouldn't go any bigger than what came stock on the truck. Your mileage WILL drop (which is contrary to common sense, but trust me, it will), your brakeing distances will be longer and the brakes will fail sooner in hard stop situations, not to mention wear and tear on the tranny/clutch as the truck wasn't designed for use with larger tires.

To negate the mileage and tranny wear, you can put a higher gear in the differential to compensate for increased tire size. However, unless you're going for 35s or something, it's probably not worth it if all you want is bigger tires. You just have to drive a little more cautiously, keeping in mind the modifications you've made.

To answer your questions, however, no, it will not confuse the ABS, though like I said, your brake distances and responsiveness WILL drop, and it will not do anything bad to the xfer case (unless you go up a couple sizes, drop a higher gear in the differentials, and pin it to the floor when you're stuck - even then, the axle shaft will usually give long before the xfer case).

If you have any specific questions, PM me. I like truck and tires.
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Old 05-30-2003, 09:47 AM   #7 (permalink)
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Well, I hit the tire shop yesterday and got the nitty gritty. In Keeping with Fords Motto (Making it as difficult for the consumer as possible ), the wheel size is 17” (265/70/17) Brilliant. This brings the cost of my Tires up $40 bones because it’s not a regular stock. I believe the stock rubber is 31 ½. I’m gonna stick with that because (like whir said) “it's because the added diameter, and width for most larger tires, will end up putting your tires into the frame, or the front bumper when you turn.” Apparently, a bigger tire “like 33’s” will not effect my transfer case or my abs as the abs indicators are on the brake discs and drums? I’m going for the BFG All Terrains because they are good in both Off Road and On Road and I spend a lot of time on both. The guy basically told me that if I want to go to a bigger, Bring my truck to pro off road shop and get them to the job (lift and all)

Thanks for the tips.
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