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Old 04-28-2014, 03:44 PM
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tires or suspension/ steering issue?

My truck is a 2000 f250 crew/short 4x4. I mostly use it for towing. I know the steering on these trucks isnt the best and they tend to wander a lot while driving even when everything is perfect. Here is my issue:
I recently made a trip to oklahoma towing a gooseneck weighing about 14k. On the way home, I stopped to change a bad tire on the rear (had a huge know on side and cords seperated, very out of round, more of an oval shape). I put on the spare and nursed it home because it still had a lot of vibratiuon (I thought the spare was badly out of balance). When I got it hoe, I realized a front tre was suffering almost the same fate (no knot but had separated cords and was oval shaped. These were nitto terra grapplers 285/75 16. I wasnt really happy with the at tire anyway so I got a new pair of BFG KM2s and put them on the back, leaving the 2 good nittos on the front. Both tires are 10 ply and rated the same. I understand the KM2 will behave a little differently due to the soft tread compound but the truck wanders a lot worse now and seems to wag the tail easily.
I thoroughly inspected everything underneath and did find a drag link end on the pitman arm side had some slack and changed it. It did improve the issues some, but they are still there. I am running 70 psi on the rear and 55 on the front (manuf specs).
I pulled my travel trailer today (6500+- with quality lad leveler/ sway control) and it wagged all the way home, but it was windy. It has me scared to have to make a sudden lane change or similar.
The truck does pull to the right some, but always had even after an alignment. Measuring the toe, I have 0.
I have thought of setting the tow in 1/32-1/16" and increasing the pressures to 80 psi to see if it helps. All bushings, sway bars, springs, ball joints, etc look to be in good shape. Truck also has air bags on rear, running about 10psi.
So, am I missing something? Are the tires too soft? I dont want to spend another $600 on 2 matching front tires and hate the truck, but dont want another set of ATs either.
Anyone????
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Old 04-29-2014, 12:30 PM
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Nobody has input?
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Old 04-29-2014, 12:32 PM
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You should be running your tires at or near max tire PSI, while towing. 55 PSI is way too low especially with the amount of weight your pulling. Try adjusting your air pressure up first.
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Old 04-29-2014, 04:03 PM
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55 front and 70 rear is ford specs, and that is about what I run unloaded. When towing I usually run 70 front, 80 rear but scares to stress the nittos in the front at the moment since 2 already failed from that set.
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