I have an 04 1500 and it came factory 265/70/17 tires. If it has 20'' wheels it's P275/55R20 as standard, and P275/60R20 as the optional.
Yes, you can.
P265/65R18 (Standard) P275/65R18 (Option 1) P275/55R20 (Option 2)
No, is the answer based on the information you provided. I really need to know the full size of both sets of tires.
No
The stock tire size for a 1998 Dodge Ram truck is P275/60R17. These tires are widely available in a variety of designs for on or off-road driving.
The recommended pressure is listed on the sticker on the drivers door jamb.
I'm not a mechanic / technician but I would say ( N0 ) That's too much of a change in tire size ( and even if you could fit it on the rim , I doubt you would have the clearance ) * a P235/70/R16 tire is 29 inches in diameter , a P275/70/R16 tire is 31.2 inches in diameter , besides being a wider tire , and a taller tire , your speedometer would be reading incorrectly ( when your speedometer shows 60 MPH you would actually be travelling at 64.6 MPH )
No, a 245 tire is 245 mm wide. A 275 is 275 mm wide.
p275-16s are near the limit. You'll have to gear down your front and rear diff, otherwise the big tires will bog you down on the highway.
The size of Chevy Avalanche wheels is around P275/55R20 111S, if you buy it from 2006. If you on the other hand, want a tire from before 2006, the size will be diffrent.
Of course you can.