Any experiences with tire size effecting warranty coverage?

[Highcountry]

I know this has been alluded to in other posts, but I didn't find what I'm really looking for. Eventually I want to upsize my tires to something a little bit taller and slightly wider. Definitely 35-12.50 or smaller. I have a 2020 2500 Crew Longbed Crew 4x4 with the Cummins. I was at the dealership picking up a replacement wheel spat yesterday and asked a service manager if he could tell me what would be considered acceptable as to not void warranties. His response was " any change in tire size would be looked at" especially in cases where extended warranties are involved. I then asked him if they view speedometer tire size calibrators as a modification and he replied no, we wouldn't even see it had been done.

I'm pretty confident that a minor tire size change isn't going to cause damage and with all the torque of the 6.7 you probably wouldn't even notice a difference, especially if the tire size is reprogrammed. I'm just concerned about losing any coverage on a transmission problem. He did mention, "they'd have to prove that was the problem." DOes anyone have any real examples of having oversized tires and still receiving warranty coverage? I have a 10 year 120,000 mile warranty and would like to preserve as much protection as I can. Thanks for any insight

 

[Cseybert]

Just my opinion. But it’s the offset rims that put strain on bearings and other parts that I would consider would be viewed by any warranty issues concerning that. But then again I’m not a service manager.

 

[Squatch]

I have a real hard time believing people’s arguments that an inch or two more of tires will hurt the transmission, as if that is worse than strapping a 10k or 20k pound trailer to the back of your truck, which is what that puppy is designed to do day in and day out. You will put more strain on your wheel bearings and ball joints, and steering, but those will wear regardless, if you gotta swap them out here and there or a little more often, it is not a big deal, and is small job that can easily be done in the driveway.

 

[Highcountry]

I have a real hard time believing people’s arguments that an inch or two more of tires will hurt the transmission, as if that is worse than strapping a 10k or 20k pound trailer to the back of your truck, which is what that puppy is designed to do day in and day out. You will put more strain on your wheel bearings and ball joints, and steering, but those will wear regardless, if you gotta swap them out here and there or a little more often, it is not a big deal, and is small job that can easily be done in the driveway.

I agree with you, especially with trucks built to tow and haul. I just wish the service departments would define what is considered an acceptable range. For myself that would probably be 35 inch tall, after that I'd consider a gear swap, but I know many run 37's with no issues. Maybe I'll keep the old ones when I get new tires in case I ever need stock size for service

 

[H3LZSN1P3R]

I have never heard anyone denied warranty for oversize tires in my 10 years as a mechanic... front end wearable items are the only thing you wont be covered for but your not going to hurt them at all remember the front axle is made to carry a big plow if needed thats a lot more stress than offset wheels and tires provide

 

[yycdiesel]

I'll try to add a link link I find it but somewhere I seen HD trucks are covered up to 35x12.5 and pwoerwagons are 37 inch tires for warranty.



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[Highcountry]

I'll try to add a link link I find it but somewhere I seen HD trucks are covered up to 35x12.5 and pwoerwagons are 37 inch tires for warranty.



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That would be great info and makes sense