Violent shudder when towing

[DaWing]

When I am towing my 3 axle car hauler I have recently been getting a severe rear driveline shudder when I accelerate hard from a dead stop or very slow speed.....springs ?......u-joint?.....bearing? ......tranny?!!!!!

[coloradostroke]

Have the driveshaft balanced.

[stumper]

I would inspect my U-joints, sounds like a bad one to me.

[whodis]

i would start wuth the u joints also

[TxToy]

I'd try greasing the driveshaft splines first, then check out the more pricey fixes if that doesn't solve it.

[haul_n_horses2]

I have also noted a little vibration, not violent, when just starting from a standstill towing at or beyond max GCWR. The dually is just level or a 1" below level when the fully loaded trailer is on the hitch. Could this be carrier alignment?

[Casey_1]

[ QUOTE ]
Could this be carrier alignment?

[/ QUOTE ]
That is most likely the problem with both trucks.