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My buddies truck did that ...and it was the bracket in the center of the f/e was cracked, it has like 3 bolts that secure it to the frame and a larger bolt that goes through it for securing the diff.... it has been a while, check that and make sure it isn't cracked or loose.
Yep, your springs are very tired. Just out of curiosity, how many miles are on this truck? from your previous post it sounds like this thing is a real veteran.
that would be your camber...You have negative camber right now (top tipped in) TTB is infamous for camber issues. Its due to the front suspension setup all together, the tire is only ever at zero camber in one spot...so as the suspension compresses (bump on road) negative camber occurs and when it rebounds positive camber occurs (top out). This only happens momentarily as you bounce over a bump.
Ideally sitting on a level surface you should have about 1-2% positive camber (top out) IIRC for a more even tire wear pattern.
Now that said, your springs are shot...you have a couple options. Safest would be to install new springs to restore ride height. You could also shim the bottom mount for the coil (moving it up, away from your axle beam)...or you could buy some ($90? IIRC a piece) adustable camber/caster bushings and have your caster/camber aligned.
At any rate once repaired, its a good thing to have the alignment checked...and not just the steering "toe-in"..although check that too, as well as the caster and camber.
Caster is the axis which the the tire pivots on while steering left or right.
My 91 250 4x4 diesel did that, it had leaf springs. I took it to fiestone and had it aligned, they told me that was normal for the diesel because of the weight of the engine. I wasnt good with that so I asked around more and got the same answers.
They only do it when its sitting still and when you back up but normal driving they styraighten up. I never wore any tires or anything.
Yep, your springs are very tired. Just out of curiosity, how many miles are on this truck? from your previous post it sounds like this thing is a real veteran.
193104 i think, so it's probably time for some springs.
can anyone tell me an easy way to get a c washer out i'm chaning the rotors and the driver side went fine but i can't get the c washer out on the passenger. this sounds like a real noob question but at 16 i'm no expert
the little retainer c-clip? best way is to get the proper tool that will open it up and you can just pull it out after. Or you can get two small standard screwdrivers, pop one end up and hold it there with one screwdriver and gently work around to the other end till she comes off.
Aligned properly your tires should only tip in when your suspension is compressed. Surprisingly enough i hear not too many shops are good with TTB suspension.
Read through this, it should give you a good idea what you are looking at under the front of your truck when it comes to the suspension TRS Magazine - Getting the most out of your Ford Twin Traction Beam suspension
note that this is from a ranger forum, but they use the same style suspension.