landon1012
I have a 2005 f350 not a dually. It has 6" rough country lift on it and I put 37x13.50x20 nitto trail grapplers. Since I put these on tires on it's all over the road and what I mean is it follows every grove or mark in the road. It feels like ur constantly having to stay on top of it like driving an old Cj7 jeep. I never had this problem with my 35" tires on stock 17" rims. Ball joints are good changed tie rid ends put dual steering stabilizers still can't figure it out. I hooked my 32 ft bumper pull travel trailer up and almost crashed. If anyone has anything like this with there ford truck and has advise please let me know. Thank you
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Chevy_mud_truck
Had the same problem on my truck when I went from 16.5x9.75 wheel to a16.5x12 wheel the wider wheel put the tire out at the high side part of the tracks in the pavement and it is constantly trying to walk up and down the grooves left from other small tires
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GM_Cody
Mine will do that, 38x15.50 20x12's and 2" spacers so im much wider than most cars... figured it was normal due to the grooves in the road like said above tho...

Have u had someone else ride with u that has a lifted superduty or drive someone else's to see if its the same? Hard to say what it could be without riding in it... some might say its pulling really bad and others say normal...

First thing i thought of was tire pressure. Check it, then maybe try 35,40,45 see if it makes a difference. Mine have 45psi
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77fordfloater
Yeah man that's what I call tracking. The wider you go the more problem you have. I cant see it being a problem with a 13.50 trail grappler though. Ive always run 18inch wide on the street and those track, some more than others. M/T Baja belted are dangerous sold those immediately. I run 11r20 xzls' now and would never go back. Narrow tires ride great. Good Luck
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mattwalker87
like everyone says- wide tires track the grooves. try dropping the front psi down a little, i run 38x15.5x20 on a 20x14 and it was horrible to drive. i dropped the psi in the fronts so the sidewalls seem a little softer and soak up the ridge on the asphalt some-or so it seems. 
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landon1012
Thanks for the info. I'm gonna drop it down from 65 to 55 psi and see if it's any better and get the caster and have it realigned to see if that helps. If it don't then the brand new tires and wheels might be coming up for sale.
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Axlesnapin
If you didn't get it aligned after the tire swap go do so.  If you local to orlando go see joesams truck and frame alignment in orlando. You won't go any where else again. Had 22x14s on my old powerstroke and 37 toyos drove perfect.  And trust me my roads around town are worst then dirt roads
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THE STRUTTIN TURKEY
i agree go to joesams. i work across down the street from them and they will get it straight. my shop sends class 8 trucks to them daily but they will work on anything.
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harleyjim
no more beer
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harleyjim
put a new shock on your steer arm my be 2 of them that will help
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http://www.bigshocks.com/" target="_blank">