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-   -   Tire size change with 4.56 (https://www.f150online.com/forums/other-powertrain/519423-tire-size-change-4-56-a.html)

dewalt17 10-04-2018 10:52 AM

Tire size change with 4.56
A friend of mine recently bought my old '05 4x4 Flareside. It has a 4.6L, 33x12.5x17's, and 4.56 gears. We were discussing possibly trading wheels/tires. My '12 has 32's, on 18's. Would the RPM increase be too much, going to 32's, on the old truck? Also on a side note, would I need to do a 2" level to fit my old wheels/tires?

Old truck

New Truck

glc 10-04-2018 01:04 PM

At 70 mph in locked up overdrive, the RPM will increase from 2275 to 2350. Not significant, that's only about 3%.

dewalt17 10-04-2018 02:27 PM

Yea, that isn't too bad then. I guess the only other thing will be tire fitment on my '12 and waiting to get speedometer corrected.

glc 10-04-2018 02:50 PM

That's only going to knock the speedo off by about 2 mph at highway speeds.

dewalt17 10-04-2018 03:55 PM

I guess I could live with that, short term, Only real concern then would be any rubbing issues, with my '12 being bone stock. Thanks!

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