4.9 with 33" tires
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Elder User
Joined: Mar 2004
Posts: 759
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From: mohave valley, arizona
4.9 with 33" tires
i have a set of 33" 12s on my jeep that are like new and i dont drive my jeep. thinking about swapping them to my 90 with the 4.9. right now im running 31" 10/50. what kind of performance loss will i get by doing this. how far off will my spedo be.
Elder User
Joined: Jul 2010
Posts: 960
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From: Saint Charles, Missouri
33x12.00 will rub the radius arm (assuming its stock backspacing)
You shouldnt see a performance decrase, i have a bddy with a 3'' body lift and 33's and his scoots along just fine
speedo should only be off a tiny tiny bit but nothin to worry about
You shouldnt see a performance decrase, i have a bddy with a 3'' body lift and 33's and his scoots along just fine
speedo should only be off a tiny tiny bit but nothin to worry about
Posting Guru
Joined: Jul 2009
Posts: 1,069
Likes: 1
From: Toledo, Ohio
I can answer this for you cause that is what my truck looks like. (33-12.50-15's)
The tires rub on the radius arms at full lock. I have never driven in Arizona but in Florida I can make a U-turn using 3 lanes total (turn lane and 2 opposites) and not get any rub from it.
My speedo is about 7mph off above 35mph.
My fuel mileage is down to 9mpg (4x4 with a C6 and 3.55 gearing) and no offense to him, but Conanski likes to point on that my stuff is all thrown off because of the tires but I know how I calculated it and I am 100% positive it is correct.
Also, I have the acceleration of a semi but once I get going I can run 85 all day long (then I run out of fuel... ha)
So, I think that is what youre looking at.
The tires rub on the radius arms at full lock. I have never driven in Arizona but in Florida I can make a U-turn using 3 lanes total (turn lane and 2 opposites) and not get any rub from it.
My speedo is about 7mph off above 35mph.
My fuel mileage is down to 9mpg (4x4 with a C6 and 3.55 gearing) and no offense to him, but Conanski likes to point on that my stuff is all thrown off because of the tires but I know how I calculated it and I am 100% positive it is correct.
Also, I have the acceleration of a semi but once I get going I can run 85 all day long (then I run out of fuel... ha)
So, I think that is what youre looking at.
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walter white
1973 - 1979 F-100 & Larger F-Series Trucks
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Dec 21, 2015 08:56 PM
