Truck fishtailing problem

I don't know what it is called, maybe a sway bar. But it's a dog bone link attached to your drive axles and the frame. Bushings could be wore out.

 

Torque rods. Check to see if the bushings are mushroomed out with the airbags inflated and then deflated

 

Well good luck on it. Might also check your steering rod and Steering Box on it to make sure they are tight? I drove a Volvo once that had been wrecked and they had to replace a piece of the frame where the steering box bolted on and it would work loose sometimes. I didnt drive that truck long, it would scare you to death in curves.

 

It was called a Walking Beam in the old days.

 

That's your problem right there I'd bet, some of those double coins do that really bad from what I've heard.

 

You need to get your drive axle suspension checked. Drop your trailer and look at the rear and see if your air springs are tilted versus straight up and down. The u-bolts bear all the weight and stretch out over time. Eventually the alignment pins rust out and the springs move across the axle. Also check the hanger bushings. I'm surprised none of the alignment people even mentioned it. It's very common and you can see it on a handful of FL trucks at any truck stop. There's an excellent video describing all this, but it's on a Facebook page and not shareable in this thread. Search for "Alignment Solutions Freightliner lean" on FB and you should see it in the results (two parts).

 

It's those crappy double coin Drive tires. It will feel like your on ice.

You'll get used to it. Lol

 

Do your double coin drives have this tread pattern by chance????

If so then look no further because that's your problem. You can air them up to 120 and it will help. But if they still scare the crap out of you then you'll have to take them off and replace with something better.

 

Had that experience also. If they are 14ply and to much air can cause squirrely handling also. Was knee deep in rubber one time and when bobtailing tractor hopped and was squirrely. Shop guy with experience told me drop psi to 90-95. Lowered them down and solved problem 98%. When 105 or 110psi the tires were just riding on the very center of tread. Especially when bobtailing. But like previous comment, thick rubber still can get more give when going into curves.

 

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