tire rub
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Freshman User
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tire rub
i have a 78 f-150 4x4 it has no lift and 38" tires under it since a buddy said they would fit and he had the tires when i wen tout of town i said sure put em on. is there a steering stop on the drivers side because when i turn to the left the back inside edge of the drivers tire is rubbing on the arm and i don't want to blow the tire. another question is how come the passenger side does not even come close to rubbing? any help
Post Fiend
Joined: Jul 2006
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Typically when a truck does not turn as far to the right as it does to the left, it indicates a short drag link. When a truck is lifted the steering box becomes farther away from the point at which it attaches to the drag link (inverted "T" type), thus limiting right hand turns. Since the drag link is short, it turns like mad to the left, but not to the right. There are stops on the axle where the knuckle contacts it, and they are adjustable.
I have never seen a a tire failure from rubbing a radius arm, just a bunch of shiney radius arms.
I think you have a bit of lift without a drop pitman arm, and that is the limiting the turning radius.
How much did you have to cut the fenders to clear?
I have never seen a a tire failure from rubbing a radius arm, just a bunch of shiney radius arms.
I think you have a bit of lift without a drop pitman arm, and that is the limiting the turning radius.
How much did you have to cut the fenders to clear?
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Freshman User
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none. when i got ther tires i was told they were the biggest i could go without modifing anything on the truck. the truck does not have any lift on it could a shorter drag have been put on it for repair maybe. are 38's to big for stock.
just another Rockwell looser
Joined: Feb 2003
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From: Cocoa, FL
38's on a stock truck is stupid big....no offense but kinda lame...
haha...i used to have the shiny radius arm syndrome, ive got a rub spot with all 3 tire sizes i had on it....i got a shiny mark close to the axle, (the 31's) few inches further (the 35 swampers & boggers) then a little further with the 38's....hahaha
haha...i used to have the shiny radius arm syndrome, ive got a rub spot with all 3 tire sizes i had on it....i got a shiny mark close to the axle, (the 31's) few inches further (the 35 swampers & boggers) then a little further with the 38's....hahaha
Post Fiend
Joined: Jul 2006
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38's are pretty big, but never too big. There is aposibility that someone installed a different drag link, or coupler and it is just too short. This would also be indicated by a steering wheel that is not straight, sometimes folks remove the wheel and re-install it on a different spline, and it throws off the radius. The same is true if the pitman arm has been removed.
Although this usually only occurs when the truck has been lifted. I have never seen a stock 78 truck clear 38's, that is why I suggested that the truck had to have some amount of lift.
Rubbing the radius arm is common with larger tires and a wheel that has limited offset, a different offset and /or backspacing will bring the tires out and help clear the arms, but then you might run into fender problems.
Have you any pics of the front end?
Although this usually only occurs when the truck has been lifted. I have never seen a stock 78 truck clear 38's, that is why I suggested that the truck had to have some amount of lift.
Rubbing the radius arm is common with larger tires and a wheel that has limited offset, a different offset and /or backspacing will bring the tires out and help clear the arms, but then you might run into fender problems.
Have you any pics of the front end?
Senior User
Joined: May 2007
Posts: 356
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From: Dinwiddie, Virginia
Man, I have done a lot of this stuff and I am sure that whether you know it are not you do have some lift on that truck to clear those 38" tires. Rubbing the arm is doing no harm but you might want to look into the steering like these guys above said because it will increase your turning radius. Rub a little on both arms, not just a lot on one side, LOL!
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