Hey everybody! I’m new here and I know that there are plenty of threads that go over this issue but I can’t find any definitive answers and I’m hoping I can find one here.

I recently went in to a local tire shop because I’m looking to get some larger tires for my truck (2010 XLT 4.6 2WD SCab) The guy working there told me I will be able to fit 285/70/17s on my stock 17” rims. My truck is sitting at completely stock ride height but I’m not sure I trust the advice. Does anybody know if these tires would fit?

Thanks.

 

Stock tire size is either 235/75x17 (30.1" diameter) or 255/65x17 (30.9" diameter). The 285/70x17 has a diameter of 32.7", at most a 6% increase.

I highly doubt that the extra .9" height (and width) increase will cause an issue.

For you listening pleasure, reading enjoyment, and tire fitment SWAGs Scientific Wild *** Guesses) ...Additional reference information -HERE-
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I hope you realize a taller tire is going to knock that 4.6 pretty hard. It's already a pretty gutless engine. Having put 135,000 on one I can tell you the current 3.7 V6 will blow the doors off the 4.6 I had and will go around a stock 5.4 anyday.........as long as there's no load and no trailer involved. The 4.6 I had I changed to a different size tire as well. I went to a 265 60 17 Yokohama Geolander. It was the "right size" tire for the truck. It looked right instead of dinky tires on it. As I recall, I didn't lose any tire height going to that size but gained a hair. What it did for the truck is make the tires look a lot beefier and filled the fender wells. FWIW, traction, ride, everything about the Yokohama tire was way over the Continentals it came with.
FWIW, I had issues with the front end of my rig. The springs on the front had basically collapsed which is a common issue for the F150. I had to put new struts on it and springs. I bought the Monroe HD springs and struts which had a lifetime warranty on it. If your truck sits down in the front, I'd have the front end checked before buying tires. After putting the larger tires on it, if I was turning on a hill sometimes I would get tire rub on the fender liner. After the new front end parts, had loads of room.

 

12thgen (O/P) didn't indicate which 4.6L the 2010 XLT 4.6 2WD SCab had - 2V -or- 3V

The 3V isn't a slouch (292 HP and 320 lb.-ft. torque) and was available.

As for your statement ... will go around a stock 5.4 anyday - 320 HP and 390 lb.-ft. torque ... that 3.7L V6 (302 HP and 278 lb.-ft. torque) might need a good tail-wind going down-hill.
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How wide are the rims? My 02 came with 17" diameter, 7 1/2" wide rims with 265/70 tires. I wanted larger tires for floatation on beach sand and from what I looked up the 285/70x17 tires were the largest that still had a rim width recommendation of 7 1/2" minimum. They fit and look great on my 02 but my truck is a 4x4 that sits up high stock.

 

I should’ve clarified: I’ve got the 3V. I knew when I bought the truck that it wasn’t exactly the most powerful engine available in the 12th gen but I’ve been pleasantly surprised with it! It’s performed much better than I anticipated.

 

I’ve got the 3V 4.6 which is a little more capable than the 2V luckily. I appreciate the advice and I actually had the tires mounted earlier this afternoon. In terms of acceleration, the 285/70/17s haven’t seemed to affect things too much and I don’t tow anything with the truck although I do haul things In the bed from time to time. The biggest difference I’ve noticed is that the ride is slightly more harsh than before but not nearly noticeable enough for me to mind: it’s still comfortable to drive and there is no noticeable road noise. The mechanic I talked to about the tires today said he’s mounted the same tires on a 12th gen 2WD before with no issues rubbing anywhere and no trimming needed so I was confident about it. All in all, I think it was a success!

 

To be honest, I’m not positive what the width of the wheels are. They’re the stock 17” 5 spoke 2010 XLT alloys. The tires were mounted today and they fit perfect! The 2WD aspect is what concerned me the most though because as you said: the 4x4s sit a little higher in the front. I found other threads that asked a similar question as me but I couldn’t find a straight answer and lots of threads where people had the 285/70/17s on their 2WDs also had levelling kits which was making me skeptical about the tires fitting my truck.

 

I've seen countless dyno sheets on the stock 5.4 of all years. NONE have ever made over 268HP. That's why the 5.4 has been such a boat anchor. It never got close to a GM 5.3 or the Hemi in power. And burned a lot of gas to be that bad vs the GM 5.3. The 5.4 is worst engine ever to sit in any truck of any brand. The 3.7 in the F150 I currently drive dynos at 307HP and that was with regular E10 ethanol bug spray. I'm now running non-ethanol, isogas 90 octane and have picked up a few more ponies but haven't had the machine available when I am to redyno the thing. The stock 3.73 also helps getting the truck moving vs the usual 3.55 or 3.15 depending on options. But the best news is the setup I currently have gets 25 MPGs hiway at 75 mph. Not bad for a bloated 4 door truck running 275/55/20 wheels/tires and a fiberglass tonneau cover.

As long as you're happy with it is all that counts. As long as you have no issues with the cam phasers, the engine will probably last longer than you'll want the truck, properly maintained.

 

Be aware the taller tire has changed your speedo/odo calibration. You might want to compare the readings with a GPS.

 

 

Blah, blah, blab, blah. And who the hell said anything about GM or Dodge? Lighten-up Francis.

*Just don't be goin' into a towing war with your 3.7L against the 5.4L, eh.

 

I’ve got to be sure to do that yet! I checked the receipts after the tire change and there was no mention of speedo/odo recalibration.

 

A tire shop is not equipped to do that. The Ford dealer may be able to do that for you, or you will need a programmer and tunes to do it yourself. With tunes, you can improve on some other things too. If it's not off far enough to bother you, you can just live with it. Reprogramming is not free.

 

But, with taller tires, you will be going faster (6% faster if that was the difference between the old tires and the new ones) than the speedometer says you are doing. If your local finest are zealous in ticketing speeders, than you will have to allow for that much error when you are driving.

- Jack