2014 peterbilt front end steering problem

Have a spec. shop that only does ft. end alt. on trucks ck. the toe in on the truck and have them hand you the print out of what the truck is set at now, then let them have a chance to fix it, then give you a print out of what they set it to, keep both papers for next time it needs alt.

 

Maybe find another driver with a similar setup and trade trucks and compare notes???

 

Are the trucks identical WB, stinger length, trailer make model? It almost sounds like you have more weight on the stinger hitch unloading the frt ax, is it any different when you load rear of trailer heavy, which "should" plant your front end, just asking questions.

 

Stand back from your steer tires and see if they have an egg shape. Check the bushings. A mis timed drive shaft could cause this. Have you had clutch work done?

 

It sounds like your steering axis inclination is too steep, that means the king pins are too close to straight up and down.

The king pin should be more rearward at the top than it is at the bottom, this is dialed in with wedge shaped blocks between the spring and axle.

If it has too much steering axis inclination it turns hard and if it has too little it turns very easy and chases every imperfection in the road.

Also instruct the alignment shop to give you 1/16 inch toe in, they like to set the toe dead even these days but that makes them steer loose; 20 years ago every alignment guy knew that but today's guys know nothing but what "the book" says.

 

Did the last shop give you a print out of what the latest setting are?