helper air bags

[4u2nv]

Do you think they would cause a rear wheel hop at some speeds ??

[leegreen]

changing suspension geometry can change how the torque loads of the axle interact with spring / control arms. So lifting your ride height up might change axle hop.

the some speeds part : wheel/ axle hop is usually only going to happen when the suspension is loading up with torque, then releasing. Like when you are loosing traction on acceleration. If you have a vibration at certain speeds, it may be something other than wheel hop.

Knowing what kind of rear suspension you are talking about might be helpful. But given the nature of this forum.....if your leaf spring suspension RWD truck has wheel hop when the tires are spinning the helper bags are probably not a big contributor. Look at stiffer springs (add back the overloads?) or add some axle twist control device, slapper bars, torque arm, caltracks

[4u2nv]

It's a 1989 gmc dually , leaf spring shock setup , does it in the 40-50 mile an hour area .
All rims balanced and front end alignment done , this could be helpful it still bounces when I let off the gas !!

[leegreen]

check driveshaft, ujoints and center bearing, then springs, shackles and bushings

did you change anything before it started?

[4u2nv]

It was like that when I bought it

[SCOTI]

Air pressure in the bags?

[4u2nv]

Originally Posted by SCOTI

Air pressure in the bags?

150 psi

[Richard]

Originally Posted by 4u2nv

150 psi

Is the truck loaded? no need to run more than 10-20 psi in bags when not in use. That is from my experience. At the low pressure unloaded the bags provide a dampening effect on the leafs, taking away the jitters on the highway.

[4u2nv]

Richard I was thinking that and just let the air out of the bags yesterday but now I have to wait till next spring to see the difference , it's stored for the winter
Thanks all for the sugestions
I wll get back on the outcome next spring

[SCOTI]

Originally Posted by 4u2nv

150 psi

Definitely too high of air psi for a helper bag.

I never needed more than 30-40 on mine. My dually w/a 4-bar + sleeve bag swap (no leaf's) usually needs mid 50's when loaded down.