New truck now pulling problems.

[Boosted1200]

Old truck was a 2015 gmc 2500 srw pulled awesome, no problems at all at any speeds. New truck is a 2016 gmc 3500 srw now when pulling it sways all over the place. At 70 you can just feel it floating side to side never had this problem with the 2500. The only difference from the 2500 to 3500 is a added leaf spring bump stops and 18s instead of 20s.

Any thoughts on this?

[ependydad]

Is there an increase in height? Are you now towing nose high?

[Brother Les]

Most likely need a little adjustment on your hitch to find your sweet spot again.

[ricky836]

Originally Posted by Boosted1200

Old truck was a 2015 gmc 2500 srw pulled awesome, no problems at all at any speeds. New truck is a 2016 gmc 3500 srw now when pulling it sways all over the place. At 70 you can just feel it floating side to side never had this problem with the 2500. The only difference from the 2500 to 3500 is a added leaf spring bump stops and 18s instead of 20s.

Any thoughts on this?

More sidewall on the 18" tires than the 20s?

[WolfWhistle]

Originally Posted by Boosted1200

Old truck was a 2015 gmc 2500 srw pulled awesome, no problems at all at any speeds. New truck is a 2016 gmc 3500 srw now when pulling it sways all over the place. At 70 you can just feel it floating side to side never had this problem with the 2500. The only difference from the 2500 to 3500 is a added leaf spring bump stops and 18s instead of 20s.

Any thoughts on this?

Trailer? Hitch? tongue weight? 70? Photos?
WW

[dieselguy]

Have you checked your new truck's tire pressure? My truck gets squirrley if I bump up the tire pressure to max as stated on the sidewall and not what's stated on the door sticker.

[dustman_stx]

Are you running a more aggressive tread pattern on the TV tires now?

[northstar1960]

What changed besides the truck . hitch height ? TW , i've got an old chevy 2500 16" rims run 80psi towing . never any issues tow like a dream . something simple changed causing your problem . i would not think the rim size is making a difference . i think brother les is right hitch adjustment

[lonb]

I went from 2006 2500hd srw to 2016 2500hd srw I had to lower the ball height


2015 hyper lite 29 hfs / 2016 gmc 2500hd

[Boosted1200]

I never measured the height in the last truck so I don't know what that was. The trucks sat the same side by side at the dealer. I'll take a pic and post to see what you guys think

[Springerdad]

Someone else mentioned it, the 18's have a taller sidewall and you may have more flex there. Are your tv tire pressures at their max?
Also, if the tires are brand new there will be some squirm there too.

[buckaroo2]

I have a new 3500 chevy and yes the height between the 2500 and 3500 difrence could be a problem adjust the hitch height or get a diffrent lower trailer reciever

[hbdiver]

Park your truck and trailer on level surface. Then with the truck uncoupled measure fender height front and back. Measure trailer height front and back. Be sure trailer is level as well. Hook up everything and check heights again. Front of truck may be a smidgen higher than the back but not lower. Same with back a smidgen lower but not much.

[D_B Travelers]

Boosted, I'll wager that the new 3500 is taller at the hitch than the 2500 and you are towing nose high now. I agree with others that this is a hitch adjustment issue, I had to drop my Equalizer hitch all the way to the very bottom holes when I changed to a 3500HD to keep the TT level. I have 18" wheels also, but with 80 PSI, I don't think sidewall flex is actually an issue. I would pull the entire rig somewhere flat where you can look at it from a distance and see if it is sitting level; I'll bet it isn't. Do some measurements from trailer frame to ground and see what you have.

[hbdiver]

I have two 2500s 2006 and 2007 I have two trailers and if I try and tow the smaller trailer with the truck I didn't set the hitch up for I can definitely feel the difference.

[RussPastuch]

I find it interesting that people buy really big trucks so they can pull a trailer at 70 MPH.

I bought the smallest F150 I could to pull the 26 foot trailer at 55 MPH and it works just great.

Must be fun watching the gas gauge drop as you drive

[D_B Travelers]

Originally Posted by RussPastuch

I find it interesting that people buy really big trucks so they can pull a trailer at 70 MPH.

I bought the smallest F150 I could to pull the 26 foot trailer at 55 MPH and it works just great.

Must be fun watching the gas gauge drop as you drive

I guess I missed where the OP said they wanted to pull at 70...my bad.

[hbdiver]

I would guess my fuel economy while towing is between 9 and 10 mpg. That is pretty good for dragging around 14,000 pounds through the Rockies and the Sierras. My 2500 is just the right size for my trailers a 32 foot and a 35 foot. T34SP 2006 Been traveling enough to have over 100,000 miles on a toy hauler. Just had to replace the roof May 2016.
Chino Hills, California.

[Boosted1200]

Originally Posted by RussPastuch

I find it interesting that people buy really big trucks so they can pull a trailer at 70 MPH.

I bought the smallest F150 I could to pull the 26 foot trailer at 55 MPH and it works just great.

Must be fun watching the gas gauge drop as you drive

The speed limit here is 70 and is 3 lanes, so yes i pull it at 70mph im not one to drive 55 in a 70 and make everyone go around me. The last truck did it fine. I have more to worry about then fuel milage in my life but thanks for the help.

[Boosted1200]

Trailer is a 39dks5