I have a '97 Ram 2500 4X4 Cummins with 109,000 mi. It's a 5 speed with 4:10 diffs.
I just had new tires put on. Nothing big. Cooper 235/85/16. Just a little taller than the stock 245/75/16. About 1" taller.
Since I had them put on, my truck seems to have a lot of roll to it. I notice it a lot when going into a curve and when driving at highway speeds when pulling out to pass. It kinda feels like it takes a second for the rear end to catch up to the front.
It's never done this before. It's always had a very stiff ride and responsive steering. Could it be the new tires? Maybe I just am not used to them yet.
What's your opinion?

 

are they the correct load range?

 

Good question.
I did order load range E but didn't actually look at the tire. However I did ask the guy mounting them about the pressure and he said he put in the recommended amount, 85# in the rear and 65# in the front. So I assumed that they were the correct ones. I'll double check.
Any other opinions?

 

uhh, he has the poundage reversed.

The rear should be slightly lower pressure than the front.

I would check the load range, check pressure. that pressure seems a bit high as well.

The other thing you have to realize is that with a larger tire there is more rubber which means you will have more side wall flex, it will also take the road more.

 

I agree with God Ram it..(great name by the way!)
its probably that combined with the way new tires make a truck feel...
its like a new pair of sneakers, they feel different until you get used to them... but really, check the load range and psi cause that could have horrible consequences if you drive highway speed (or above) often!!!

 

Thanks again for the replies.
I did check everything last night. Verified load range E on tire, factory sticker on door pillar specified 65 front and 85 rear however I did lower the rears to 70# since I don't haul heavy loads all the time. Also checked the rear sway bar, springs, etc. Looked good.
I guess since they are new I'll have to get used to the way they ride.

My'97 Ram has been and is a great truck. Still performs great!

My '05 Jeep Wrangler, that's another story.

 

would dropping it down to a 235 make a diffrence?? thats a little narrower tire then your old 245's

 

FYI, your sticker can't say 85 psi, it's 80, which is the max for a lr E tire.

I agree with GOD RAM IT...the 235/85 has more sidewall and regardless of what psi you put in or what load range it is, it will always seem to "roll" more than the factory size

 

You're correct. It is 80# for the rear.
The 235/85/16 is just a little taller and a little narrower. That's what i was trying to acomplish to fill up some of the space between the top of the tire and fender.
I see what you mean by having more sidewall and having more roll as a result. I've had 235s before. Just didn't notice the roll as much I guess.
Think going down to 65# in the rear would hurt anything? Of course I'll air them back up when hauling or towing.

 

It won't hurt anything, but it'll seem to "roll" more, as the sidewall will be even softer with less psi.