Ok guys I’m fed up with searching for this issue. Truck is a 2007 Peterbilt 379 short hood. It was a TMC rig back in its prime. So… I’ve been chasing suspension problems over a year. Things replaced are as follows:
Steering gearbox
King pins
Leaf springs
Leaf spring shackles/bushings
Shocks
Steer axle wheel bearings
Tires
Steering shaft knuckles
Rear torque bars
Rear shocks
Driveshaft from carrier bearing back
I’m sure there’s more I’m forgetting but I’m feeling a wobble or bounce that’s giving me a headache and rides like ###. It’s worse if I’m bobtailed. I’ve had the alignment done a dozen times in the last year as well as yesterday morning. All the components show tight. Several shops have verified this. If you spin the tire it doesn’t wobble. I just replaced steer shocks yet again when it was aligned and still problem persists. Sleeper shocks and the sleeper stabilizer bar have been replaced. Air bags were new last year. It chopped the driver steer tire within 8 months but that could have easily just been a coincidence from the alignment being out (thank you Chicago). Just replaced the steers again last week and had them balanced. Problem persists. Everything shows tight every time it’s checked anywhere I go. What is going on with this truck??
379 Wobble/bounce issue
Discussion in 'Peterbilt Forum' started by HammerTransport, May 17, 2021.
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Also the motor mounts got replaced last year and are tight. Clutch is also new.
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You need to check tires with a runout gauge and check to see if rim is centered on hub. The look up Ron at Tru balance.
What brand of steers are you running?062 Thanks this. -
Where do you feel it... wheel,feet,butt?
Is it speed dependent? -
if its a wobble and you changed all those parts, that leaves only one other thing. The matting surface from your brake drums to you wheels or drums to hub.. Somewhere on that truck on some or must of the drums or even your tandems wheel to wheel, You have rust build up or particles and your surfaces arent flat enough. Better start dissambling all and get high speed grinder out with buff pad of your choice. Wheels arent true. Thats gonna take you all weekend
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Of course I notice it more at highway speeds than I do at city speeds. I don’t know if that means it’s not there or if it’s not noticeable. But highway speeds primarily. Bobtailed it’s a lot worse. I feel a very small bit of it in the steering wheel. Most of it I feel in the front of the cab. The back seems ok, I feel some of it in the floor toward the front. I don’t feel it in the seat anymore after I replaced my driveshaft. -
jamespmack Thanks this.
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Ironman in my opinion are garbage. But check gap between rim and tang on hub. I'm willing to bet they are close on few, far apart on others. Or just remove 2 lug nuts and see if stud is centered in hole of the rim. -
Have you made any progress on fixing the issue?
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