Truck Bounce

Since the OP was last active on 2/15 of last year, I would say it a safe bet he either got it fixed, or gave up and got a different truck.

 

Would appreciate any advise about my 99 Pete
I have a 1999 379 peterbilt ext hood with a terrible bounce wobble. The bounce/wobble is about to beat me to death and it does it around 60-65mph really bad. If I am fully loaded weighting 80000lbs I feel very little bounce or wobble. I am pulling a brand new Fontaine infinity flat bed. As soon as you take weight off of my trailer the truck begins to bounce wobble beat me to death. It is literally about to drive me crazy.
I have replaced the 5th wheel plate,cab bushing, stabilizing bar on back of cab, cab shocks, all shocks on truck including steers. I have brand new brake drums and brakes. (Brake drums are Fleetpride brand) New tie rod ends. I have had my tires balanced all tires balanced. I have rotated the tires. The truck is still beating me to death.
I have checked to see if there are any tires out of round. I feel the shake mostly in the floor of the truck. I have recently replaced the clutch. New flywheel. New bearings in the power divider. New bearings in the front nose cone of the rear chunk.
I do have an unexplained buckling of my steer tires. It looks like a saw blade effect. Bridgestone 283
i have spun the tires to check for out of round, wobbling etc no such luck there.
Please any advise would be greatly appreciated.

 

Try calling around and finding someone that still does tire trueing and speed balancing. The amount they cut off your tires is nothing compared to the smooth feeling of a trued tire that has been speed balanced. I have been through what you are talking about and this was the only thing that fixed it.

If you have Centramatics or something simular, throw them away and do this. I had my tires speed balanced with them on and it shook the whole truck. They were taken off and speed balanced, and the bounce was gone. The centramatics were put back on and the axle bounced again. Back off and it was smooth. Nothing can beat a trued tire and a speed balance. That way the tire and wheel are completely round and completely balanced to the round tire and rim.

I hated to see the rubber come off new tires, but once I went down the road I knew it was worth every bit of it.

 

Thank you! I'm concerned it maybe a rear end because the back rear end does have some slack in it. Last night I did notice that when I was in a pull and let off the throttle going up a hill the truck ran smoothly but once I accelerated that is when the truck started bouncing again. Could it possibly be a rear end issue or transmission issue. I also do need a 3 axle alignment but I hate to keep sinking money in stuff that wasn't broke to begin with.