feel slugish at top end

[NEW2DMAX]

2001 2500HD 45,000 miles: When pulling a 20' gooseneck empty the last few times the trailer seems to really drag the truck down at top end 65 to 70 mph. I have put on larger / new tires 265's, could this be a problem (tire size) :confused:

[Kennedy]

How many miles on the fuel filter?

[NEW2DMAX]

I change the fuel filter every 10,000. It was changed at 42,000 now have 44,600

[NEW2DMAX]

Kennedy... Do you have any more input???????

[Kennedy]

What does your air box look like? Is it still ducted into the fender?

Tire size will have some effect. The Van Aaken 70-110 power box very simple, and will pick up the slack and then some...

[SLT556]

Does the truck behave normaly w/o the trailer?