Low Speed Towing Growl

[rlaspinall]

I pull a 32' Fifth wheel aprox 13000 lbs. If I take off from a stop agressivly, I get a growl from below and mainly behind. Does any one else have this issue?
The truck has the guts to get up and go pretty quick.

 

[WD40]

Have you checked to see how far you are dropping the rear of your truck when you hook up the trailer?
If the weight of your trailer is dropping your truck 3 or 4 inches, your drive shaft may be hitting on take off.
If that's what's going on I would add a set of air bags to the rear of your truck.
Doug

 

[rlaspinall]

Have you checked to see how far you are dropping the rear of your truck when you hook up the trailer?
If the weight of your trailer is dropping your truck 3 or 4 inches, your drive shaft may be hitting on take off.
If that's what's going on I would add a set of air bags to the rear of your truck.
Doug

Thanks
I haven't checked but will next time. It shouldn't be as the rated payload is 4500 lb and when loaded with the trailer is 3200 lb.

 

[BIG JOE]

If I take off from a stop agressivly, I get a growl from below and mainly behind.

When you do an aggresive take off.. when the engine/drive-train torques up, it could be causing something to rub.. making a growling sound (like Doug said).. or the exhaust hitting on something ? Look for shiney spots. Or the spring sets loading up ? Spray a 50/50 mix of liquid soap, or WD-40 on the spring sets. (better if you jack it up first)

Joe